#include <stdio.h>
#include <iostream>
#include <string>
#include <string.h>
#include <algorithm>
#include <map>
using namespace std;

int main()
{ 
    map<int, char> myMap;
    myMap[0] = '1';
    myMap[1] = '0';
    myMap[2] = 'X';
    myMap[3] = '9';
    myMap[4] = '8';
    myMap[5] = '7';
    myMap[6] = '6';
    myMap[7] = '5';
    myMap[8] = '4';
    myMap[9] = '3';

    int arr[17] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
    string str;
    while (cin >> str)
    {
        bool flag = true;
        int len = str.length();
        if (len == 18)
        {
            int sum = 0;
            for (int i = 0; i < len - 1; i++)
            {
                sum += (str[i] - '0') * arr[i];
            }
            int remain = sum % 11;
            char jiao = str[17];
            if (remain != 10)
            {
                if (myMap[remain] == jiao)
                {...