#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;



signed main()
{
    string yuki = "yukicoder", S;
    cin >> S;
    REP(i,S.length()) if (S[i] == '?') {
        cout << yuki[i] << endl;
        return 0;
    }
}