#include <bits/stdc++.h>
using namespace std;
typedef int64_t lint;

int main()
{
    string yuki="yukicoder";
    string s;
    cin>>s;
    for(int i=0;i!=s.size();i++){
        if(s[i]=='?'){
            cout<<yuki[i]<<endl;
            break;
        }
    }
    // system("pause");
}