diff --git a/src/day4/mod.rs b/src/day4/mod.rs
index 456746c..9fba754 100644
--- a/src/day4/mod.rs
+++ b/src/day4/mod.rs
@@ -1,26 +1,53 @@
+use log::debug;
+
 use super::utils::Part;
 
 struct Card {
     nb_winning: u32
 }
 
-pub fn parse(line: &str) -> Card {
+fn parse(line: &str) -> Card {
+    debug!("Processing {}", line);
     let (_, values) = line.split_once(':').unwrap();
     let (winning, numbers) = values.split_once('|').unwrap();
+    let nb_win : Vec<u32> = winning.trim().split(' ').filter(|v| !v.is_empty()).map(|v| v.parse().unwrap()).collect();
+    let nb_card : Vec<u32> = numbers.trim().split(' ').filter(|v| !v.is_empty()).map(|v| v.parse().unwrap()).collect();
 
-    todo!()
+    debug!("{:?}", nb_win);
+    debug!("{:?}", nb_card);
+
+    let mut value = 0;
+    for nb in nb_card {
+        if nb_win.contains(&nb) {
+            if value == 0 {
+                value = 1;
+            }else{
+                value *= 2;
+            }
+        }
+    }
+
+    Card { nb_winning: value }
 }
 
 pub fn solve(lines: Vec<String>, part: Part) -> u32 {
+    let mut sum = 0;
+    for line in lines {
+        sum += parse(&line).nb_winning;
+    }
 
-
-    todo!()
+    sum
 }
 
 #[cfg(test)]
 mod tests {
+    use super::parse;
+
     #[test]
     fn test_line() {
         let line = "Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53".to_owned();
+
+        let card = parse(&line);
+        assert_eq!(card.nb_winning, 8);
     }
 }
\ No newline at end of file