from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline

A,B = map(int,input().split())
B *= 60*60
A *= 1000
if A>B:
    print('KoD')
elif A==B:
    print('same')
else:
    print('blackyuki')