def find_marker(signal:str, marker_length=4) -> int:
    for i in range(marker_length,len(signal)):
        subsignal = signal[i-marker_length:i]
        if len(set(subsignal)) == marker_length:
            return i
    else:
        return -1

test = [
    'mjqjpqmgbljsphdztnvjfqwrcgsmlb',
    'bvwbjplbgvbhsrlpgdmjqwftvncz',
    'nppdvjthqldpwncqszvftbrmjlhg',
    'nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg',
    'zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw'
]

for s in test:
    print(find_marker(s), find_marker(s, 14), )

print('~'*10)
with open('2022/6/datastream.txt') as filein:
    signal = filein.read()
    print(find_marker(signal), find_marker(signal, 14))