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card_number = input("请输入信用卡号：\n").strip()
card_number = card_number.replace(" ", "").replace("-", "")


if not card_number.isdigit():
    print("校验失败：信用卡号只能包含数字、空格或连字符")
elif not 13 <= len(card_number) <= 19:
    print("校验失败：信用卡号长度应为13～19位")
else:
    
    array = []
    for i in card_number:
        array.append(int(i))

    
    total = 0
    for i in range(len(array) - 2, -1, -1):
        number = array[i]
        if (len(array) - 2 - i) % 2 == 0:
            number *= 2
            if number > 9:
                number -= 9
        total += number

    
    check_digit = (10 - total % 10) % 10

    if check_digit == array[-1]:
        print("校验成功")
    else:
        print("校验失败")