using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] s = Console.ReadLine().Split('.');
            string[] s1 = Console.ReadLine().Split('.');
            int count = 0;
            int[] b = new int[3];
            for (int i = 0; i < s.Length; i++)
            {
                int a = int.Parse(s[i]);
                int a1 = int.Parse(s1[i]);

                if (a >= a1)
                {
                    b[i]++;
                }
                else
                {
                    b[i]--;
                    
                }

            }
            

            if (b[0] >0)
            {
                Console.WriteLine("YES");
            }
            else if (b[0] < 0&&b[1] > 0)
            { 
                Console.WriteLine("YES");
            }
            else if(b[0] < 0 && b[1] < 0&& b[1] > 0)
            {
                Console.WriteLine("YES");
            }
            else
            {
                Console.WriteLine("NO");
            }
         


        }
    }
}