#include <algorithm>
#include <iostream>

using namespace std;

int main(int argc, const char* argv[])
{
	string S;
	cin >> S;
	int cnt = 0;
	for (int i = 0; i < 8; i++) {
		string B;
		cin >> B;
		cnt += count(B.begin(), B.end(), 'b');
		cnt += count(B.begin(), B.end(), 'w');
	}
	string _S = S == "oda" ? "yukiko" : "oda";
	cout << (cnt % 2 == 0 ? S : _S) << endl;
	return 0;
}