没注意ID Corrent（ID Correct）WA一次

#include<bits/stdc++.h>
using namespace std;

int v[20] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
char c[20] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};

int main()
{
    string num;
    while(cin >> num)
    {
        if(num.size() != 18) 
        {
            cout << "ID Wrong" << endl;
            continue;
        }
        
        int sum = 0;
        for(int i = 0; i < 17; i ++)
            sum += ((num[i] - '0') * v[i]);
        
        if(c[sum % 11] == num.back()) cout << "ID Corrent" << endl;
        else cout << "ID Wrong" << endl; 
    }
    
    return 0;
}