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] += 1;
                    count++;
                }
            }
            if (b[0] == 0 && b[1]>0 && b[2]==0)
            {
                Console.WriteLine("YES");
            }
            else if(b[0] == 0 && b[1] == 0 && b[2] > 0)
            {
                Console.WriteLine("YES");
            }
            else if (count == 3||b[0]<0)
            {
                Console.WriteLine("YES");
            }
            else
            {
                Console.WriteLine("NO");
            }

        }
    }
}