func main()
	var ans: bool :: f(cui@input()) & f(cui@input())
	do cui@print(ans ?("OK\n", "NG\n"))
	
	func f(s: []char): bool
		for i(0, 12345)
			if(i.toStr() = s)
				ret true
			end if
		end for
		ret false
	end func
end func