#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {

    string a = "yukicoder";

    string S;
    cin>>S;

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

    return 0;
}