#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>
#include<functional>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000
#define PI 3.14159265358979

using namespace std;
typedef pair<int, int> P;

int main(void) {
	string s;
	vector<string>a(9);
	int count = 0;

	cin >> s;
	FOR(i, 1, 8) {
		cin >> a[i];
		FOR(t, 0, 7) {
			if (a[i][t] == 'b'||a[i][t]=='w') {
				count++;
			}
		}
	}

	if (count%2==0) {
		cout << s << endl;
	}
	else {
		if (s == "oda") {
			cout << "yukiko" << endl;
		}
		else {
			cout << "oda" << endl;
		}
	}
	return 0;
}