#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 100000000000000000


int main(){
	
	string s;
	cin>>s;
	
	string opp;
	if(s[0]=='y')opp = "oda";
	else opp = "yukiko";
	
	int cnt =0;
	rep(i,8){
		string temp;
		cin>>temp;
		rep(j,temp.size()){
			if(isalpha(temp[j]))cnt^=1;
		}
	}
	
	if(cnt==0)cout<<s<<endl;
	else cout<<opp<<endl;
	
	return 0;
}