#include <bits/stdc++.h>
using namespace std;
#define REP(i,N) for(int i=0;i<N;i++)
int main(){
	string S,T;
	char B[64];
	int total=0;
	cin>>S;
	if(S=="oda")	T="yukiko";
	else			T="oda";
	REP(i,64){
		cin>>B[i];
		if(!B[i]=='.')		total++;
	}
	if(total%2)	cout<<T<<endl;//gote
	else 	cout<<S<<endl;//sente
	return 0;
}