#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

string S, board[8];
int cnt;

int main() {
  cin >> S;
  for (int i = 0; i < 8; i++) cin >> board[i];
  for (int i = 0; i < 8; i++) {
    for (int j = 0; j < 8; j++) {
      if (board[i][j] != '.') cnt++;
    }
  }
  if (cnt % 2 == 0) cout << S << endl;
  else {
    if (S == "oda") cout << "yukiko" << endl;
    else cout << "oda" << endl;
  }
  return 0;
}