#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  string S; cin >> S;
  int now = 0;
  if(S == "oda") now++;
  for(int i = 0; i < 64; i++){
    char C; cin >> C;
    if(C != '.') now++;
  }
  string ans;
  now%2 == 0 ? ans = "yukiko" : ans = "oda";
  cout << ans << endl;
}