using System;
using System.Linq;
using System.Collections.Generic;

static class NagataKanaIsAGenius {
    public static void Main() {
        int[]a=Console.ReadLine().Split().Select(int.Parse).ToArray();
        int ans=a[1]-a[0]-1;
        Console.WriteLine(0<=ans?"YES":"NO");
        Console.WriteLine(0<ans?ans:-ans);
    }
}