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

namespace offkai
{
	class Program
	{
		static void Main(string[] args)
		{
			int men = int.Parse(Console.ReadLine());
			int women = int.Parse(Console.ReadLine());

			if (women >= men)
			{
				Console.WriteLine("yes\r\n"+ (women - men));
				Console.ReadLine();
			}
			else
			{
				Console.WriteLine("no\r\n" + (men - women));
				Console.ReadLine();
			}
			
		}
	}
}