#include <bits/stdc++.h>
using namespace std;

int main () {

    string compare, compare2;
    cin >> compare >> compare2;
    if (compare.length() == compare2.length() ) {
        int i2 = compare.length()-1;
        for (int i = 0; i < compare.length(); i++) {
            //cout<<endl;
                //cout<<compare[i]<<' '<<compare2[i2]<<endl;
            if (compare[i] != compare2[i2]) {
                cout<<"NO";
                return 0;
            }
            i2--;
        }
        cout<<"YES";
        return 0;
    }
    cout<<"NO";
}