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 JAVA (judge verdict: Accepted)

import java.io.*;

class Main {
    public static void main (String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder(br.readLine());
        for (int i = 0; i < sb.length(); i++) {
            char c = sb.charAt(i);
            if (Character.isUpperCase(c)) {
                sb.setCharAt(i, Character.toLowerCase(c));
            } else {
                sb.setCharAt(i, Character.toUpperCase(c));
            }
        }
        System.out.println(sb.toString());
    }
}