Problem:
Score : 100 points

Problem Statement

You are given a string S of length 2 or 3 consisting of lowercase English letters. If the length of the string is 2, print it as is; if the length is 3, print the string after reversing it.

Constraints

The length of S is 2 or 3.

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If the length of S is 2, print S as is; if the length is 3, print S after reversing it.

Sample Input 1

abc

Sample Output 1

cba

As the length of S is 3, we print it after reversing it.

Sample Input 2

ac

Sample Output 2

ac

As the length of S is 2, we print it as is.

Solution in PHP7 (7.0.15) (judge verdict: Accepted)

<?php

function input() {
    return trim(fgets(STDIN));
}
function input_array() {
    return explode(' ', input());
}

$S = input();
switch (strlen($S)) {
    case 2:
        echo $S . "\n";
        break;
    case 3:
        echo strrev($S) . "\n";
        break;
    default:
        throw new Exception('Invalid String Length');
}