Problem:
Reverse Sequence

Write a program which reverses a given string str.

Input

str (the size of str ≤ 20) is given in a line.

Output

Print the reversed str in a line.

Sample Input

w32nimda

Output for the Sample Input

admin23w

Solution in PHP (judge verdict: Wrong Answer)

<?php
fscanf( STDIN, "%s", $str );

$last=strlen($str)-1;
$middle=($last+2)/2;
for($i=0; $i<$middle; $i++) $str[ $last - $i ] = $str[$i];

echo $str;
?>