using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] str = Console.ReadLine().Split(' ');
            int b = int.Parse(str[0])+1;
            int g = int.Parse(str[1]);
            int zan = b - g;
            if (zan == 0||b<g)
            {
                Console.WriteLine("YES");
                Console.WriteLine(zan);
            }
            else
            {
                if(zan<0)
                {
                    zan = zan * -1;
                }
                Console.WriteLine("NO");
                Console.WriteLine(zan);
            }
        }
    }
}