#include <bits/stdc++.h>

using namespace std;

int main() {
    string s;
    string y = "yukicoder";
    
    cin >> s;
    
    for (int i = 0; i < s.length(); i++) {
        if (s[i] == '?') {
            cout << y[i] << endl;
            return 0;
        }
    }
    
    return 0;
}