#include<iostream>
using namespace std;
#define REP(i,n) for (int i=0;i<(n);i++)
    char S[10],ans[]={"yukicoder\0"};
int main(){
    ios::sync_with_stdio(false);
    cin>>S;
    REP(i,9){
        if(S[i]=='?'){
            cout<<ans[i]<<endl;
            break;
        }
    }
}