50分，求大佬帮助

#include <bits/stdc++.h>
using namespace std;
int main() {
	char num[12];
	int sum = 0;
	for (int i = 0; i <= 12; i++){
		cin >> num[i];
	}
	int x = 1;
	for (int i = 0; i <= 10; i++){
		if (num[i] == '-'){
			continue;
		}
		sum += (num[i] - '0') * x;
		x++;
	}
	if (sum % 11 == (num[12] - '0')){
		cout << "Right" << endl;
		return 0;
	}
	for (int i = 0; i <= 11; i++){
		cout << num[i];
	}
	cout << sum % 11 << endl;
	return 0;
}