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

namespace test_2
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] people = Console.ReadLine().Split();
            int boy = int.Parse(people[0]);
            int girl = int.Parse(people[1]);

            int amari = 0;

            if (boy == girl)
            {
                Console.WriteLine("NO");

            }
            else if (boy > girl)
            {
                Console.WriteLine("NO");
                amari = boy - girl +1;

            }
            
            else if (girl > boy)
            {
                Console.WriteLine("YES");
                amari = girl - boy - 1;
            }

            Console.WriteLine(amari);
        }
    }
}