#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONGINF 1000000000000000000
int main() {
	string s;
	cin >> s;
	int a = 0, b = 0;
	REP(i, 8) {
		string c;
		cin >> c;
		REP(q, c.length()) {
			if (c[q] == 'b') {
				a++;
			}
			else if (c[q] == 'w') {
				b++;
			}
		}
	}
	int wow = a + b;
	if (wow%2 == 0) {
		cout << s << endl;
	}
	else {
		if (s == "oda") {
			cout << "yukiko" << endl;
		}
		else cout << "oda" << endl;
	}
	return 0;
}