#include <bits/stdc++.h>
using namespace std;

int main()
{
	int64_t a, b;
	cin >> a >> b;
	if(a * 1000 > b * 3600) cout << "KoD" << endl;
	else if(a * 1000 == b * 3600) cout << "same" << endl;
	else cout << "blackyuki" << endl;
	return 0;
}