using System.Numerics;

public class Program
{
    public static void Main()
    {
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;


        int boy = int.Parse(str[0]) + 1;
        int girl = int.Parse(str[1]);

        if (boy<= girl)
        {
            Console.WriteLine("YES");
            string h = (boy - girl).ToString().Replace("-", "");
            Console.WriteLine(h);
        }
        else
        {
            Console.WriteLine("NO");
            string h = (boy - girl).ToString().Replace("-", "");
            Console.WriteLine(h);

        }
    }
}