#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
using namespace std;
#define Would
#define you


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