#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>

using namespace std;
int main(){
    string S;
    cin >> S;
    string t = "yukicoder";
    for(int i = 0; i < S.length(); i++){
        if(S[i] == '?'){
            cout << t[i] << endl;
        }
    }
    
    return 0;
    }