#include <bits/stdc++.h>

using namespace std;

#define FOR(i, j, k) for(int i = j; i < k; ++i)
#define rep(i, j) FOR(i, 0, j)
#define repr(i, j) for(int i = j; i >= 0; --i)
#define INF (1 << 30)
#define MOD 1e9 + 7

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;

int main() {
	string s;
	char tmp[10] = "yukicoder";
	cin >> s;
	rep(i, 9) {
		if(s[i] == '?') {
			cout << tmp[i] << endl;
		}
	}
	return 0;
}