#include <iostream>
#include <bits/stdc++.h>
using namespace std;


int main(){
	string b[2] = {"oda","yukiko"};
	string s;
	cin >> s;
	if( b[0] != s ) swap(b[0],b[1]);
	string t,u;
	while( cin >> t ) u += t;
	cout <<  b[count(u.begin(),u.end(),'b') > count(u.begin(),u.end(),'w')] << endl;
	
}