#include<iostream>
using namespace std;

int main()
{
	string s1, s2, s3;
	cin >> s1 >> s2;
	for (int i = s1.length()-1; i >= 0; i--)
	{
		s3 += s1[i];
	}
	if (s3 == s2)
		cout << "YES\n";
	else
		cout << "NO\n";

	return 0;
}