import scala.math._

object Main{
  def main(args: Array[String]){
    val input=io.Source.stdin.getLines().mkString("\n");
    println(solve(input).trim());
  }

  def solve(input:String):String={
    val ab = input.split(" ").map(_.toInt);
    val a = ab(0);
    val b = ab(1);
    Array(if(a+1<=b)"YES" else "NO",abs(a+1-b).toString).mkString("\n")
  }
}