#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
const int64_t mod = 1e9 + 7;

int main() {
	string S,T;
	cin >> S;

	if (S == "oda") T = "yukiko";
	else T = "oda";

	int b, w;
	b = 0;
	w = 0;
	for (int i = 0; i < 8; i++) {
		string s;
		cin >> s;

		b += count(s.begin(), s.end(), 'b');
		w += count(s.begin(), s.end(), 'w');
	}
	//cout << b + w << endl;

	int sum = b + w;
	if (sum % 2 == 0) {
		cout << S << endl;
	}
	else {
		cout << T << endl;
	}
}