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

namespace class2
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] ver1 = Console.ReadLine().Split('.');
            string[] ver2 = Console.ReadLine().Split('.');

            for(int i = 0; i < ver1.Length; i++)
            {
                if(int.Parse(ver1[i]) > int.Parse(ver2[i]))
                {
                    Console.WriteLine("YES");
                    break;
                }
                else if(int.Parse(ver1[i]) < int.Parse(ver2[i]))
                {
                    Console.WriteLine("NO");
                    break;
                }
            }
            if(ver1 == ver2)
            {
                Console.WriteLine("NO");
            }
        }
    }
}