Problem:
Score : 100 points

Problem Statement

You are given a grid with 2 rows and 3 columns of squares.
The color of the square at the i-th row and j-th column is represented by the character C_{ij}.

Write a program that prints YES if this grid remains the same when rotated 180 degrees, and prints NO otherwise.

Constraints

C_{i,j}(1 \leq i \leq 2, 1 \leq j \leq 3) is a lowercase English letter.

Input

Input is given from Standard Input in the following format:

C_{11}C_{12}C_{13}
C_{21}C_{22}C_{23}

Output

Print YES if this grid remains the same when rotated 180 degrees; print NO otherwise.

Sample Input 1

pot
top

Sample Output 1

YES

This grid remains the same when rotated 180 degrees.

Sample Input 2

tab
bet

Sample Output 2

NO

This grid does not remain the same when rotated 180 degrees.

Sample Input 3

eye
eel

Sample Output 3

NO

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;

#define rep(i, n) for(int i=0; i<n; i++)

int N;
int A[100010];
int B[100010];
int C[100010];

int main() {
    cin >> N;
    rep(i, N) scanf("%d", &A[i]);
    rep(i, N) scanf("%d", &B[i]);
    rep(i, N) scanf("%d", &C[i]);

    sort(A, A+N);
    sort(C, C+N);

    int i, k;
    long int  cnt = 0;
    rep(j, N) {
        i = distance(A, upper_bound(A, A+N, B[j]-1));
        k = distance(C, lower_bound(C, C+N, B[j]+1));
        cnt += i * (N-k);
    }

    cout << cnt << endl;
}