using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = int.Parse(line[0]);
        var b = int.Parse(line[1]);
        var w = a + b + 1 - Min(a + 1, b) * 2;
        if (w == 0) { Console.WriteLine("YES\n0"); }
        else if (a == b) { Console.WriteLine("NO\n1"); }
        else if (a < b) { Console.WriteLine("YES\n{0}",w); }
        else { Console.WriteLine("NO\n{0}", w); }
    }
}