#include <iostream>
#include <string>
using namespace std;

int main() {
    string s; cin >> s;
    string yukicoder = "yukicoder";

    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == '?') {
            cout << yukicoder[i] << endl;
            break;
        }
    }
}