using System;
using System.Linq;

class Program {
  static void Main() {
    var arr = Console.ReadLine().Split().Select(int.Parse).ToArray();
    var a = arr[0] + 1;
    var b = arr[1];
    Console.WriteLine(a <= b ? "YES" : "NO");
    Console.WriteLine(Math.Abs(a - b));
  }
}