import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        String t = in.next();
        StringBuffer sb = new StringBuffer(s);
        StringBuffer tb = new StringBuffer(t);

        if (tb.equals(sb.reverse())) System.out.println("YES");
        else System.out.println("NO");
    }
}