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import hashlib

def mine(key, zeros=5):
    key = key.encode()
    n = 0
    z = '0' * zeros
    while True:
        n += 1
        nb = str(n).encode()
        hex = hashlib.md5(key + nb).hexdigest()
        if hex.startswith(z):
            return n

assert mine('abcdef', 5) == 609043
assert mine('pqrstuv', 5) == 1048970

mine('yzbqklnj', 5)

mine('yzbqklnj', 6)