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

int main(){
   int count = 0;
   string s;
   cin >> s;
   for(int i = 0;i < 8;i++){
      string board;
      cin >> board;
      for(int j = 0;j < 8;j++) if(board[j] == 'b' || board[j] == 'w') count++;
   }
   if(s == "oda" && count & 1) cout << "oda" << endl;
   else cout << "yukiko" << endl;
}