import random


def win_lose_streak(upper_limit):
    win = 0
    lose = 0
    tracking_set = set()

    for each in range(upper_limit):
        coin_flip = random.randrange(1, 3)

        if coin_flip == 1:
            win += 1
            lose = 0
        else:
            lose += 1
            win = 0

        if win != 0 and win not in tracking_set:
            tracking_set.add(win)
        elif lose != 0 and lose not in tracking_set:
            tracking_set.add(lose)

    return tracking_set


if __name__ == '__main__':
    print(win_lose_streak(1000000))