#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	string s,b;
	cin>>s;
	int cnt=0;
	while(cin>>b)
		cnt+=count(b.begin(),b.end(),'.');
	cout<<(cnt%2==0?s:s=="oda"?"yukiko":"oda")<<endl;
}