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

$input = trim(fgets(STDIN));
foreach (str_split($input) as $c) {
    $chars[] = (ctype_upper($c)) ? (strtolower($c)) : (strtoupper($c));
}

echo implode('', $chars), PHP_EOL;