#include <bits/stdc++.h>
using namespace std;
const int MOD = 1e9 + 7;
void solve() {
  string s1;
  string s2;
  cin >> s1 >> s2;
  string ans = "";
  for (int i = s2.length() - 1; i >= 0; --i) {
    ans += s2[i];
  }
  if (s1 == ans) {
    cout << "YES"
         << "\n";
  } else {
    cout << "NO"
         << "\n";
  }
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int t = 1;
  while (t--) {
    solve();
  }
}
