def checkio(number: int) -> int:
    number = str(number)
    x = 1
    for y in number:
        if y != '0':
            x *= int(y)
    return x


if __name__ == '__main__':
    print('Example:')
    print(checkio(123405))

    # These "asserts" using only for self-checking and not necessary for auto-testing
    assert checkio(123405) == 120
    assert checkio(999) == 729
    assert checkio(1000) == 1
    assert checkio(1111) == 1
    print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")