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
  $str = trim(fgets(STDIN));
  for($i = 0; $i < strlen($str); $i++) {
    if (ctype_upper($str[$i]) == true){
      print strtolower($str[$i]);
    } else {
      print strtoupper($str[$i]);
    }
  }
?>