Day 6 completed, part1.py is now executable

day6/part1.py

@@ -0,0 +1,20 @@
+from common import parse
+
+
+def all_different_characters(input: str) -> bool:
+    return all(map(lambda c: input.count(c) == 1, input))
+
+
+def solve(input: str) -> int:
+    i = 0
+    while i < len(input) and not all_different_characters(input[i : i + 4]):
+        i += 1
+    return i + 4
+
+
+def main():
+    print(solve(parse("input")))
+
+
+if __name__ == "__main__":
+    main()