day03.diff

diff --git a/src/day03/part1.py b/src/day03/part1.py
index d1da5f3..e173a90 100644
--- a/src/day03/part1.py
+++ b/src/day03/part1.py
@@ -7,7 +7,7 @@ def main() -> None:
     s = 0
     for line in data.splitlines():
         mid = int(len(line) / 2)
-        a, b = line[:mid], line[mid:]
+        a, b = line[:mid], set(line[mid:])
 
         for ch in a:
             if ch in b:
diff --git a/src/day03/part2.py b/src/day03/part2.py
index d6e6d78..6974760 100644
--- a/src/day03/part2.py
+++ b/src/day03/part2.py
@@ -7,7 +7,7 @@ def main() -> None:
     s = 0
     lines = data.splitlines()
     for i in range(0, len(lines), 3):
-        a, b, c = lines[i], lines[i + 1], lines[i + 2]
+        a, b, c = lines[i], set(lines[i + 1]), set(lines[i + 2])
 
         for ch in a:
             if ch in b and ch in c: