import java.util.Scanner;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long A = sc.nextLong()*1000;
        long B = sc.nextLong()*3600;
        if(A>B)
            System.out.println("KoD");
        else if(A<B)
            System.out.println("blackyuki");
        else
            System.out.println("same");
    }
}