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

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int firstNum = int.Parse(Console.ReadLine());
            int secondNum = int.Parse(Console.ReadLine());

            int firstDelimeter = 10;
            int secondDelimeter = 10;

            int count = 0;

            int multyply = 10;

            int a = 0;
            while (true)
            {
                int lastDigitFirst = (firstNum % firstDelimeter);
                int lastDigitSecond = (secondNum % secondDelimeter);

                if (a > 0)
                {
                    lastDigitSecond = (secondNum % secondDelimeter) / multyply;
                    multyply = multyply * 10;
                }
                if (lastDigitSecond == lastDigitFirst)
                {

                    firstNum = firstNum / 10;

                    multyply = 10;
                    secondDelimeter = 10;
                    a = -1;

                }
                else
                {

                    secondDelimeter = secondDelimeter * 10;

                }


                if (firstNum == 0)
                {
                    count++;
                    break;
                }

                if (multyply > 1000000000)
                {
                    break;
                }
                a++;

            }

            if (count == 1)
            {
                Console.WriteLine("Yes");
            }else
            {
                Console.WriteLine("No");
            }



        }
    }
}