using System;

public class Elyaa

{

    public static void Main()

    {

    int a,g,b,c,y,x;

        a=int.Parse(Console.ReadLine());

        g=a%10;

        b=a/10;

        c=int.Parse(Console.ReadLine());

        y=c%10;

        x=c/10;

        if(g==x&&b==y){

            Console.WriteLine("yes");

        }

        else{

            Console.WriteLine("no");

​

        }

    }

}

​