"""Digits Multiplication - https://checkio.org/mission/digits-multiplication/"""


def checkio(number):
    result = 1
    for x in str(number):
        r = int(x)
        if r:
            result *= r
    return result


# These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
    assert checkio(123405) == 120
    assert checkio(999) == 729
    assert checkio(1000) == 1
    assert checkio(1111) == 1
