#include<iostream>
#include<string>
#include<algorithm>

int main() {
	std::string first_player;

	std::cin >> first_player;

	int black = 0, white = 0;
	std::string area;
	for (int i = 0; i < 8; i++) {
		std::cin >> area;
		black += std::count(area.begin(), area.end(), 'b');
		white += std::count(area.begin(), area.end(), 'w');
	}

	if ((black + white) % 2 == 0) {
		std::cout << first_player << std::endl;
	} else {
		std::cout << (first_player == "oda" ? "yukiko" : "oda") << std::endl;
	}

	return 0;
}