201312-2 ISBN号码

#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;

string s;

int main() {
	cin >> s;
	
	int num = 0;
	for (int i = 0, p = 1; i < s.size() - 1; ++i)
		if (s[i] != '-') {
			num += (s[i] - '0') * p;
			p++;
		}
	num %= 11;
	
	char res;
	if (num == 10) res = 'X';
	else res = num + '0';
	
	if (res == s.back()) printf("Right\n");
	else {
		s = s.substr(0, s.size() - 1);
		s.push_back(res);
		cout << s << endl;
	}
	
	return 0;
}