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 = b - a - 1;
        if (w >= 0) { Console.WriteLine("YES\n0"); }
        else { Console.WriteLine("NO\n{0}",-w); }
    }
}