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

string s;
int main() {
	cin >> s;
	if (s == "?ukicoder") cout << "y" << endl;
	if (s == "y?kicoder") cout << "u" << endl;
	if (s == "yu?icoder") cout << "k" << endl;
	if (s == "yuk?coder") cout << "i" << endl;
	if (s == "yuki?oder") cout << "c" << endl;
	if (s == "yukic?der") cout << "o" << endl;
	if (s == "yukico?er") cout << "d" << endl;
	if (s == "yukicod?r") cout << "e" << endl;
	if (s == "yukicode?") cout << "r" << endl;
	return 0;
}