diff --git a/2022/d03/ex1/ex1.py b/2022/d03/ex1/ex1.py
new file mode 100755
index 0000000..95f341f
--- /dev/null
+++ b/2022/d03/ex1/ex1.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: list[str]) -> int:
+    def score(line: str) -> int:
+        common_items = set(line[: len(line) // 2]) & set(line[len(line) // 2 :])
+        assert len(common_items) == 1  # Sanity check
+        common = common_items.pop()
+        return common.isupper() * 26 + ord(common.lower()) - ord("a") + 1
+
+    return sum(map(lambda line: score(line), input))
+
+
+def main() -> None:
+    input = sys.stdin.read().splitlines()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()