# coding=utf-8

__author__ = 'ipetrash'

if __name__ == '__main__':
    number_card = raw_input("Number card: ")
    sum = 0
    digits = [int(x) for x in number_card if x.isdigit()]
    digits.reverse()
    for i in xrange(len(digits)):
        p = digits[i]
        if i % 2 is not 0:
            p *= 2
            if p > 9:
                p -= 9
        sum += p

    print("sum: %d" % sum)
    sum = 10 - (sum % 10)
    sum = 0 if sum is 10 else sum

    print("checksum: %s" % sum)
    print("card number is correct" if (sum % 10 is 0) else "card number is incorrect")