https://www.acwing.com/problem/content/435/

#include<bits/stdc++.h>
using namespace std;
int a(char a){
    return a-'0';
}
int main(){
    char s[20];
    cin>>s;
    int k=1;
    int ans=0;
    for(int i=0;i<=10;i++){
        if(s[i]>='0'&&s[i]<='9'){
            ans+=a(s[i])*k;
            k++;
        }
    }
    if(ans%11==a(s[12])||(ans%11==10&&s[12]=='X'))printf("Right");
    else{
        s[12]=ans%11==10?'X':ans%11+'0';
        printf("%s",s);
    }
    return 0;
}