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

class Magatro
{
    static void Main()
    {
        int[] A = Console.ReadLine().Split('.').Select(s => int.Parse(s)).ToArray();
        int[] B = Console.ReadLine().Split('.').Select(s => int.Parse(s)).ToArray();
        
        for(int i = 0; i < 3; i++)
        {
            if (A[i] > B[i])
            {
                Console.WriteLine("YES");
                return;
            }
            if (A[i] < B[i])
            {
                Console.WriteLine("NO");
                return;
            }
        }
        Console.WriteLine("YES");
    }
}