func main()
	var x: int :: cui@inputInt()
	var y: int :: cui@inputInt()
	if(x = y)
		do cui@print("0\n")
	elif(y = 0)
		do cui@print("1\n")
	elif(x = 0)
		do cui@print("2\n")
	else
		do cui@print("-1\n")
	end if
end func