fun main(){
    val AB = readLine()!!.split(" ")
    val A = AB[0].toInt()
    val B = AB[1].toInt()
    println(if(A + 1 == B){
        println("YES")
        0
    } else if(A + 1 > B){
        println("NO")
        A + 1 - B
    } else {
        println("YES")
        B - A - 1
    })
}