#include <bits/stdc++.h>

using namespace std;

int main()
{
  string S;
  cin >> S;
  string other = S == "oda" ? "yukiko" : "oda";

  int A = 0;
  for(int i = 0; i < 8; i++) {
    string B;
    cin >> B;
    A += count(begin(B), end(B), 'w');
  }
  if(A & 1) cout << other << endl;
  else cout << S << endl;
}