using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] s = Console.ReadLine().Split('.');
            string[] s1 = Console.ReadLine().Split('.');
            int a = int.Parse(s[0]) - int.Parse(s1[0]);
            int b = int.Parse(s[1]) - int.Parse(s1[1]);
            int c = int.Parse(s[2])- int.Parse(s1[2]); 

            if (a  > 0)
            {
                Console.WriteLine("YES");
            }
            else if (a==0&&b > 0)
            {
                Console.WriteLine("YES");
            }
            else if (a==0&&b==0 &&c > 0)
            {
                Console.WriteLine("YES");
            }
            else if(a == 0 && b == 0 && c == 0)
            {
                Console.WriteLine("YES");
            }
            else
            {
                Console.WriteLine("NO");
            }
            



        }
    }
}