#include <bits/stdc++.h>
using namespace std;

int main() {
  string s;
  cin >> s;
  int cnt = 0;
  for (int i = 0; i < 64; i++) {
    char c;
    cin >> c;
    if (c != '.') cnt++;
  }
  if ((s == "oda") ^ (cnt % 2 == 0)) cout << "yukiko" << endl;
  else cout << "oda" << endl;
  return 0;
}