import std;
import core.bitop;
import core.checkedint;
import core.time;

void main() {
	int a, b;
	readf("%d %d\n", a, b);
	const c = b * 3600.0L / 1000;
	writeln(a > c ? "KoD" : a < c ? "blackyuki" : "same");
}