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()