#include<iostream>
#include <string.h>
#include<string>
using namespace std;
int main(){

	string S;
	int co=0;
	cin>>S;
	char a[64];
	for(int i=0;i<64;i++){
		cin>>a[i];
			if(strcmp(&a[i],".")==0)
				co++;
	}	
	if(co%2==0)
		cout<<S<<endl;
	else{
		if(S=="oda")
			cout<<"yukiko"<<endl;
		else
			cout<<"oda"<<endl;
		}

	return 0;
}