#include <algorithm>
#include <iostream>
#include <iomanip>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
using namespace std;

#define FOR(i,s,e) for (int i = int(s); i < int(e); i++)
#define FORIT(i,c) for (typeof((c).begin()) i = (c).begin(); i != (c).end(); i++)
#define ISEQ(c) (c).begin(), (c).end()

int main(){
	string s;
	cin >> s;

	string p[2];
	if(s == "oda") {
		p[0] = "oda";
		p[1] = "yukiko";
	}else{
		p[0] = "yukiko";
		p[1] = "oda";
	}

	string b = "";
	FOR(i,0,8){
		string tmp;
		cin >> tmp;
		b += tmp;
	}
	int count = 0;
	FOR(i,0,64){
		if (b[i] == 'w' || b[i] == 'b') count++;
	}

	string ans = p[count%2];
	cout << ans << endl;
	return 0;
}