diff --git a/.idea/advent_of_code_2022.iml b/.idea/advent_of_code_2022.iml
index 975d3e9..a802623 100644
--- a/.idea/advent_of_code_2022.iml
+++ b/.idea/advent_of_code_2022.iml
@@ -6,6 +6,7 @@
       <sourceFolder url="file://$MODULE_DIR$/common/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/day_01/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/day_02/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/day_03/src" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
     </content>
     <orderEntry type="inheritedJdk" />
diff --git a/Cargo.toml b/Cargo.toml
index fb6482d..9246031 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,2 +1,2 @@
 [workspace]
-members = ['common', 'cli', 'day_01', 'day_02']
+members = ['common', 'cli', 'day_01', 'day_02', 'day_03']
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 328ee7d..5736a0c 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -9,4 +9,5 @@ edition = "2021"
 clap = { version = "4.0", features = ["derive"] }
 day_01 = { path = "../day_01"}
 day_02 = { path = "../day_02"}
+day_03 = { path = "../day_03"}
 common = { path = "../common"}
diff --git a/cli/src/main.rs b/cli/src/main.rs
index 6c3c35a..f98db12 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -57,6 +57,20 @@ fn main() -> Result<(), Box<dyn Error>> {
             );
             Ok(())
         }
+        (day @ Day::Three, part @ Part::One) => {
+            println!(
+                "{}",
+                day_03::run_day_and_part(day, part, input_str.as_str())
+            );
+            Ok(())
+        }
+        (day @ Day::Three, part @ Part::Two) => {
+            println!(
+                "{}",
+                day_03::run_day_and_part(day, part, input_str.as_str())
+            );
+            Ok(())
+        }
 
         (_, _) => {
             unimplemented!()
diff --git a/common/src/lib.rs b/common/src/lib.rs
index 6893af0..72d951c 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -4,6 +4,7 @@ use clap::ValueEnum;
 pub enum Day {
     One,
     Two,
+    Three,
 }
 
 #[derive(ValueEnum, Copy, Clone, Debug)]
diff --git a/day_02/src/parser.rs b/day_02/src/parser.rs
index 1b7163a..baf2869 100644
--- a/day_02/src/parser.rs
+++ b/day_02/src/parser.rs
@@ -142,98 +142,6 @@ impl From<(Hand, ResultExpected)> for Trick {
     }
 }
 
-pub(crate) mod part_02 {
-    use crate::parser::{against_hand_parser, result_expected_parser, Hand, ResultExpected, Trick};
-    use nom::character::complete::{char, line_ending};
-    use nom::multi::separated_list1;
-    use nom::sequence::separated_pair;
-    use nom::IResult;
-
-    fn trick_parser(s: &str) -> IResult<&str, Trick> {
-        let (rest, hands): (&str, (Hand, ResultExpected)) =
-            separated_pair(against_hand_parser, char(' '), result_expected_parser)(s)?;
-        Ok((rest, hands.into()))
-    }
-
-    fn sequence_parser(s: &str) -> IResult<&str, Vec<Trick>> {
-        separated_list1(line_ending, trick_parser)(s)
-    }
-
-    pub(crate) fn parse(inp: &str) -> Vec<usize> {
-        let (_, tricks): (&str, Vec<Trick>) = sequence_parser(inp).expect("Couldn't parse input");
-        tricks.iter().map(|trick| trick.score()).collect()
-    }
-
-    #[cfg(test)]
-    mod tests {
-        use super::*;
-        use crate::parser::{draw_expected, loss_expected, win_expected};
-
-        #[test]
-        fn win_expected_parsed() {
-            assert_eq!(Ok(("", ResultExpected::Win)), win_expected("Z"))
-        }
-        #[test]
-        fn draw_expected_parsed() {
-            assert_eq!(Ok(("", ResultExpected::Draw)), draw_expected("Y"))
-        }
-        #[test]
-        fn loss_expected_parsed() {
-            assert_eq!(Ok(("", ResultExpected::Lose)), loss_expected("X"))
-        }
-
-        macro_rules! param_test {
-            ($($name:ident: $input:literal , $against:expr , $result:expr , $thrown:expr;)*) => {
-                $(#[test]
-                fn $name() {
-                    assert_eq!(
-                        Ok((
-                            "",
-                            Trick {
-                                thrown: $thrown,
-                                against: $against
-                            }
-                        )),
-                        trick_parser($input)
-                    )
-                })*
-            };
-        }
-
-        param_test!(
-            rock_thrown_loss_expected:  "A X" , Hand::Rock , ResultExpected::Lose , Hand::Scissors;
-            rock_thrown_draw_expected: "A Y", Hand::Rock, ResultExpected::Draw, Hand::Rock;
-            rock_thrown_win_expected: "A Z", Hand::Rock, ResultExpected::Win, Hand::Paper;
-
-            paper_thrown_loss_expected:  "B X" , Hand::Paper , ResultExpected::Lose , Hand::Rock;
-            paper_thrown_draw_expected: "B Y", Hand::Paper, ResultExpected::Draw, Hand::Paper;
-            paper_thrown_win_expected: "B Z", Hand::Paper, ResultExpected::Win, Hand::Scissors;
-
-            scissors_thrown_loss_expected:  "C X" , Hand::Scissors , ResultExpected::Lose , Hand::Paper;
-            scissors_thrown_draw_expected: "C Y", Hand::Scissors, ResultExpected::Draw, Hand::Scissors;
-            scissors_thrown_win_expected: "C Z", Hand::Scissors, ResultExpected::Win, Hand::Rock;
-        );
-
-        #[test]
-        fn example_sequence_parsed() {
-            assert_eq!(
-                Ok(("", vec![
-                    Trick {
-                        against: Hand::Rock,
-                        thrown: Hand::Rock,
-                    },
-                    Trick {
-                        against: Hand::Paper,
-                        thrown: Hand::Rock,
-                    },
-                    Trick {
-                        against: Hand::Scissors,
-                        thrown: Hand::Rock,
-                    }
-                ])), sequence_parser("A Y\nB X\nC Z")
-            )
-        }
-    }
-}
+pub(crate) mod part_02;
 
 pub(crate) mod part_01;
diff --git a/day_02/src/parser/part_02.rs b/day_02/src/parser/part_02.rs
new file mode 100644
index 0000000..882cfd3
--- /dev/null
+++ b/day_02/src/parser/part_02.rs
@@ -0,0 +1,91 @@
+use crate::parser::{against_hand_parser, result_expected_parser, Hand, ResultExpected, Trick};
+use nom::character::complete::{char, line_ending};
+use nom::multi::separated_list1;
+use nom::sequence::separated_pair;
+use nom::IResult;
+
+fn trick_parser(s: &str) -> IResult<&str, Trick> {
+    let (rest, hands): (&str, (Hand, ResultExpected)) =
+        separated_pair(against_hand_parser, char(' '), result_expected_parser)(s)?;
+    Ok((rest, hands.into()))
+}
+
+fn sequence_parser(s: &str) -> IResult<&str, Vec<Trick>> {
+    separated_list1(line_ending, trick_parser)(s)
+}
+
+pub(crate) fn parse(inp: &str) -> Vec<usize> {
+    let (_, tricks): (&str, Vec<Trick>) = sequence_parser(inp).expect("Couldn't parse input");
+    tricks.iter().map(|trick| trick.score()).collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::parser::{draw_expected, loss_expected, win_expected};
+
+    #[test]
+    fn win_expected_parsed() {
+        assert_eq!(Ok(("", ResultExpected::Win)), win_expected("Z"))
+    }
+    #[test]
+    fn draw_expected_parsed() {
+        assert_eq!(Ok(("", ResultExpected::Draw)), draw_expected("Y"))
+    }
+    #[test]
+    fn loss_expected_parsed() {
+        assert_eq!(Ok(("", ResultExpected::Lose)), loss_expected("X"))
+    }
+
+    macro_rules! param_test {
+        ($($name:ident: $input:literal , $against:expr , $result:expr , $thrown:expr;)*) => {
+            $(#[test]
+            fn $name() {
+                assert_eq!(
+                    Ok((
+                        "",
+                        Trick {
+                            thrown: $thrown,
+                            against: $against
+                        }
+                    )),
+                    trick_parser($input)
+                )
+            })*
+        };
+    }
+
+    param_test!(
+        rock_thrown_loss_expected:  "A X" , Hand::Rock , ResultExpected::Lose , Hand::Scissors;
+        rock_thrown_draw_expected: "A Y", Hand::Rock, ResultExpected::Draw, Hand::Rock;
+        rock_thrown_win_expected: "A Z", Hand::Rock, ResultExpected::Win, Hand::Paper;
+
+        paper_thrown_loss_expected:  "B X" , Hand::Paper , ResultExpected::Lose , Hand::Rock;
+        paper_thrown_draw_expected: "B Y", Hand::Paper, ResultExpected::Draw, Hand::Paper;
+        paper_thrown_win_expected: "B Z", Hand::Paper, ResultExpected::Win, Hand::Scissors;
+
+        scissors_thrown_loss_expected:  "C X" , Hand::Scissors , ResultExpected::Lose , Hand::Paper;
+        scissors_thrown_draw_expected: "C Y", Hand::Scissors, ResultExpected::Draw, Hand::Scissors;
+        scissors_thrown_win_expected: "C Z", Hand::Scissors, ResultExpected::Win, Hand::Rock;
+    );
+
+    #[test]
+    fn example_sequence_parsed() {
+        assert_eq!(
+            Ok(("", vec![
+                Trick {
+                    against: Hand::Rock,
+                    thrown: Hand::Rock,
+                },
+                Trick {
+                    against: Hand::Paper,
+                    thrown: Hand::Rock,
+                },
+                Trick {
+                    against: Hand::Scissors,
+                    thrown: Hand::Rock,
+                }
+            ])), sequence_parser("A Y\nB X\nC Z")
+        )
+    }
+}
diff --git a/day_03/Cargo.toml b/day_03/Cargo.toml
new file mode 100644
index 0000000..ed3125f
--- /dev/null
+++ b/day_03/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "day_03"
+version = "0.0.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+common = {path = '../common'}
+phf = { version = "0.11.1", features = ["macros"] }
diff --git a/day_03/src/lib.rs b/day_03/src/lib.rs
new file mode 100644
index 0000000..8385d3f
--- /dev/null
+++ b/day_03/src/lib.rs
@@ -0,0 +1,98 @@
+use std::collections::HashSet;
+use common::{Day, Part};
+use phf::phf_map;
+
+static VALUES: phf::Map<char, usize> = phf_map!{
+    'a' => 1,
+    'b' => 2,
+    'c' => 3,
+    'd' => 4,
+    'e' => 5,
+    'f' => 6,
+    'g' => 7,
+    'h' => 8,
+    'i' => 9,
+    'j' => 10,
+    'k' => 11,
+    'l' => 12,
+    'm' => 13,
+    'n' => 14,
+    'o' => 15,
+    'p' => 16,
+    'q' => 17,
+    'r' => 18,
+    's' => 19,
+    't' => 20,
+    'u' => 21,
+    'v' => 22,
+    'w' => 23,
+    'x' => 24,
+    'y' => 25,
+    'z' => 26,
+    'A' => 27,
+    'B' => 28,
+    'C' => 29,
+    'D' => 30,
+    'E' => 31,
+    'F' => 32,
+    'G' => 33,
+    'H' => 34,
+    'I' => 35,
+    'J' => 36,
+    'K' => 37,
+    'L' => 38,
+    'M' => 39,
+    'N' => 40,
+    'O' => 41,
+    'P' => 42,
+    'Q' => 43,
+    'R' => 44,
+    'S' => 45,
+    'T' => 46,
+    'U' => 47,
+    'V' => 48,
+    'W' => 49,
+    'X' => 50,
+    'Y' => 51,
+    'Z' => 52,
+};
+
+pub fn run_day_and_part(day: Day, part: Part, inp: &str) -> usize {
+    match (day, part) {
+        (Day::Three, Part::One) => part01_parse(inp).iter().sum(),
+        (Day::Three, Part::Two) => part02_parse(inp).iter().sum(),
+        (_, _) => unimplemented!(),
+    }
+}
+
+fn part01_parse(inp: &str) -> Vec<usize> {
+    let inp = inp.split_whitespace();
+    inp.map(|row: &str| row.split_at(row.len() / 2))
+        .map(|(left, right): (&str, &str)| (HashSet::from_iter(left.chars()),
+                              HashSet::from_iter(right.chars())))
+        .map(|(left, right): (HashSet<char>, HashSet<char>)| *left.intersection(&right).next().unwrap())
+        .map(|i: char| VALUES[&i])
+        .collect::<Vec<usize>>()
+}
+
+fn part02_parse(inp: &str) -> Vec<usize> {
+    vec![]
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part_01_example_works() {
+        let input = r#"vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw"#;
+        let result = 2 + 2 ;
+        assert_eq!(result, 4);
+    }
+}