Problem:
Toggling Cases

Write a program which converts uppercase/lowercase letters to lowercase/uppercase for a given string.

Input

A string is given in a line.

Output

Print the converted string in a line. Note that you do not need to convert any characters other than alphabetical letters.

Constraints

The length of the input string < 1200

Sample Input

fAIR, LATER, OCCASIONALLY CLOUDY.

Sample Output

Fair, later, occasionally cloudy.

Solution in PHP (judge verdict: Accepted)

<?php
$C=str_split(fgets(STDIN));
$s='';
foreach($C as $c){
	$n=ord($c);
	if($n<65)$s.=$c;
	elseif($n<91)$s.=chr($n+32);
	elseif($n<97)$s.=$c;
	elseif($n<123)$s.=chr($n-32);
	else $s.=$c;
}
echo $s;