#include <iostream>
#include <string>
using namespace std;

int main() {
  string s, b, B, W;
  int cnt = 0;
  cin >> s;
  B = s;
  if (B == "oda") W = "yukiko";
  else W = "oda";
  for (int i = 0; i < 8; i++) {
    cin >> b;
    for (auto& e : b) {
      if (e == 'b' || e == 'w') cnt++;
    }
  }
  if (cnt % 2) cout << W << endl;
  else cout << B << endl;
}