import java.util.Scanner

object Yuki780 {
  val sc = new Scanner(System.in)
  def main(args: Array[String]): Unit ={
    val a = sc.nextInt
    val b = sc.nextInt

    println(if(b - (a + 1) >= 0) "YES" else "NO")
    println(Math.abs(b - (a + 1)))

  }

}