#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long lint;

#define MIN(a,b) ((a)<(b)?(a):(b))
#define MAX(a,b) ((a)>(b)?(a):(b))



int main()
{
	string input, str = "yukicoder";
	cin >> input;
	for (int i = 0; i < str.size(); i++)
		if (input[i] == '?') cout << str[i] << endl;

	return 0;
}