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

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string N = Console.ReadLine();
            string X = Console.ReadLine();
            string[] verstr = N.Split('.');
            string[] judgestr = X.Split('.');
            int cnt = 0;
            for (int i = 0; i < verstr.Length; i++)
            {
                int ver = int.Parse(verstr[i]);
                int judge = int.Parse(judgestr[i]);
                if(ver>=judge)
                {
                    cnt++;
                }
                else
                {
                    Console.WriteLine("NO");
                    break;
                }
            }
            if(cnt==3)
            {
                Console.WriteLine("YES");
            }
            
        }

    }
}