#!/usr/bin/python

from sys import stdin

print "Enter your old ISBN or SBN:"
isbn = stdin.readline()

isbn = filter(lambda a: a in "0123456789X", isbn)
if len(isbn) == 9: isbn = '0' + isbn

if len(isbn) != 10:
    print "Invalid ISBN or SBN!"
    exit(1)

check = (2 - sum(map(lambda (a, b): a * b, zip([3, 1] * 4 + [3],
                                               map(int, isbn[:-1]))))) % 10
isbn = "978" + isbn[:-1] + str(check)

print "Your ISBN-13 is \033[1m%s\033[0m" % isbn