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]);

            boy++;

            int girl = int.Parse(people[1]);

            int amari = 0;

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

            Console.WriteLine(amari);
        }
    }
}