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: WA: Presentation Error)

<?php

$input=trim(fgets(STDIN));

foreach(str_split($input) as $s){

	// print $s . "\t";
	printf("%s",CharCheck($s)) . "\n";
	// print $s . "\n";
}

function CharCheck($str){

	for($i=65;$i<65+26;$i++){

		if(chr($i)==$str){

			return chr($i+32);

		}

	}

	for($i=97;$i<97+26;$i++){

		if(chr($i)==$str){

			return chr($i-32);

		}

	}

	// ??§???????°?????????\????????????????????????
	return $str;


}