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

int main() {
  string S;
  cin >> S;
  vector<string> B(8);
  for (int i = 0; i < 8; ++i)
    cin >> B[i];
  int count = 0;
  for (int i = 0; i < 8; ++i)
    for (int j = 0; j < 8; ++j)
      if (B[i][j] == 'b' || B[i][j] == 'w')
        ++count;
  if (count % 2 == 0)
    cout << S << endl;
  else if (S == "oda")
    cout << "yukiko" << endl;
  else
    cout << "oda" << endl;
}