#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  string s;
  cin>>s;
  Int cnt=s=="oda";
  for(Int i=0;i<8;i++){
    string b;
    cin>>b;
    cnt+=8-count(b.begin(),b.end(),'.');    
  }
  cout<<(cnt&1?"oda":"yukiko")<<endl;
  return 0;
}