# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	try:
		A = int(input())
	except:
		print("NG")
		return

	try:
		B = int(input())
	except:
		print("NG")
		return

	if A <= 12345 and B <= 12345:
		print("OK")
	else:
		print("NG")



if __name__ == '__main__':
	main()