#!/usr/bin/env python
# -*- encoding: utf-8; py-indent-offset: 4 -*-

# Author: Sebastian Mark
# CC-BY-SA (https://creativecommons.org/licenses/by-sa/4.0/deed.de)

# pylint: disable=missing-module-docstring,missing-function-docstring,consider-using-f-string


def readinput():
    with open("input", "r", encoding="utf-8") as file:
        lines = file.read().strip()
    return lines


def main():
    datastream = readinput()

    # part 1
    for i in range(len(datastream) - 4):
        uniq = set(datastream[i : i + 4])
        if len(uniq) == 4:
            print("Frist marker at %d" % (i + 4))
            break

    # part 2
    for i in range(len(datastream) - 14):
        uniq = set(datastream[i : i + 14])
        if len(uniq) == 14:
            print("Frist marker at %d" % (i + 14))
            break


if __name__ == "__main__":
    main()