#include<iostream>
using namespace std;
int main()
{
    string str;
    cin>>str;
    int sum=0;
    for(int i=0,j=1;i+1<str.size();i+=1)if(str[i]!='-')sum+=(str[i]-'0')*j,j+=1;
    sum%=11;
    char c='X';
    if(sum<10)c='0'+sum;
    if(c==str.back())cout<<"Right";
    else
    {
        str.back()=c;
        cout<<str<<endl;
    }
}

没什么好说的,"10"为"X"我是真吐了

#include <bits/stdc++.h>
using namespace std;
int main(){
    string q; cin>>q; int sum=0;
    for(int t=1,i=0;i<11;i++)
        if(q[i]!='-')sum+=(q[i]-'0')*t++;
    sum%=11; char s=sum<10?sum+'0':'X';
	if(s!=q[12])q[12]=s; else q="Right";
    cout<<q; return 0;}