#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using namespace std;
using ull = uint64_t;
using Height = int;

void solve() {
  string s;
  cin >> s;

  int idx = 0;
  for(size_t i=0; i<s.size(); ++i) {
    if(s[i] == '?') {
      idx = i;
      break;
    }
  }

  cout << "yukicoder"[idx] << endl;
}

void wrapper() {
  int loop;
  cin >> loop;
  rep(i, loop) {
    cout << "[TEST " << i + 1 << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}