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
$S=fgets(STDIN);
$l=strlen($S);
for($i=0;$i<$l;$i++){
	$n=ord($S[$i]);
	if(64<$n && $n<91) print chr($n+32);
	elseif(96<$n && $n<123) print chr($n-32);
	else print $S[$i];
}