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

namespace Equal__Words
{
    class Program
    {
        static void Main(string[] args)
        {
            string FirstWord = Console.ReadLine();
            string SecondWord = Console.ReadLine();
            string FWord = FirstWord.ToLower();
            string SWord = SecondWord.ToLower();
            string FWordU = FirstWord.ToUpper();
            string SWordU = SecondWord.ToUpper();
            if ((FirstWord == SecondWord) || (FirstWord == SWord) || (SecondWord == FWord) ||
               (FirstWord == SWordU) || (SecondWord == FWordU) || (FWordU == SWordU))
                Console.WriteLine("yes");
            else
                Console.WriteLine("no");
        }
    }
}