#include <iostream>
#include <string>
using namespace std;
int main() {
	string S;
	int disc_num = 0;
	string name[2] = { "oda","yukiko" };
	string boards[8];
	cin >> S;
	if (S == "yukiko") { disc_num++; }
	for (int i = 0; i < 8;i++) {
		cin >> boards[i];
		for (int j = 0; j < 8; j++) {
			if (boards[i][j] == 'w' || boards[i][j] == 'b') {
				disc_num++;
			}
		}
	}
	cout << name[disc_num % 2] << endl;
	return 0;
}