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

namespace yukicoder
{
    class yc
    {
        static void Main()
        {
            string[] str1 = Console.ReadLine().Split('.');
            string[] str2 = Console.ReadLine().Split('.');
            int[] num1 = new int[3];
            int[] num2 = new int[3];
            bool end = false;

            for (int i = 0; i < 3; i++)
            {
                num1[i] = int.Parse(str1[i]);
                num2[i] = int.Parse(str2[i]);
            }

            if (num1[0] == num2[0] & num1[1] == num2[1] & num1[2] == num2[2])
            {
                Console.WriteLine("YES");
                end = true;
            }

            if (!end)
            {
                for (int i = 0; i < 3; i++)
                {
                    if (num1[i] > num2[i])
                    {
                        Console.WriteLine("YES");
                        break;
                    }
                    else if (num1[i] < num2[i])
                    {
                        Console.WriteLine("NO");
                        break;
                    }
                }
            }
        }
    }
}