#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	string S;
	cin >> S;
	string T;
	if (S == "oda") T = "yukiko";
	else T = "oda";
	vector<vector<char>> ab(8, vector<char>(8));
	int res = 0;
	rep(i, 8) {
		rep(j, 8) {
			cin >> ab[i][j];
			if (ab[i][j] == 'w' || ab[i][j] == 'b') res++;
		}
	}
	res -= 4;
	if (res % 2 == 0) cout << S << endl;
	else cout << T << endl;
	return 0;
}