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

int main() {
	string S, B;
	bool X = 0;
	cin >> S;
	if (S == "oda") X = 1;
	for (int i = 0; i < 8; i++) {
		cin >> B;
		for (int j = 0; j < 8; j++) {
			if (B[j] != '.') X = !X;
		}
	}
	if (X == 0) cout << "yukiko" << endl;
	else cout << "oda" << endl;
}