#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
//---------------------------
using namespace std;
//---------------------------
#define REP(i,n) for(int i = 0; i < (n); i++)
#define P(x) cout << (x) << "\n"
//---------------------------


int main(){
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);


  string s1,s2;cin >> s1;
  if (s1 == "oda") {
    s2 = "yukiko";
  }else{
    s2 = "oda";
  }
  int ans=0;
  REP(i,8){
    string t;cin>>t;
    
    REP(j,8){
      if (t[j] == 'w'|| t[j] == 'b') {
        ans++;

      }
    }
  }
  cout << (ans % 2 ==0 ? s1 : s2 );
  return 0;
}