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

int main(){
	string player1,player2;
	cin >> player1;
	int b = 0,w = 0;
	for(int i = 0; i < 8; i++){
		string masu;
		cin >> masu;
		for(int j = 0; j < 8; j++){
			if(masu[j] == 'w') w++;
			else if(masu[j] == 'b') b++;
		}
	}
	if(player1 == "oda") player2 = "yukiko";
	else player2 = "oda";
	cout << (w >= b ? player1 : player2) << endl;
	return 0;
}