func main()
	var ss: [][]char :: cui@input().split(" ")
	var a: int :: ss[0].toInt(&)
	var b: int :: ss[1].toInt(&)
	var ans: bool :: a + 1 <= b
	do cui@print("\{ans ?("YES", "NO")}\n")
	do cui@print("\{(b - a - 1).abs()}\n")
end func