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

$input = trim(fgets(STDIN));
$len = strlen($input);
if ($len === 2) {
	echo $input;
}else{
	for ($i=$len-1; $i >= 0; $i--) { 
		echo $input[$i];
	}
}