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.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String line = sc.nextLine();
        String ans = "";
        for(int i = 0 ;i < line.length();i++){
            char ch = line.charAt(i);
            if(Character.isUpperCase(ch) == true){
                ch = Character.toLowerCase(ch);
            }
            else if(Character.isLowerCase(ch) == true){
                ch = Character.toUpperCase(ch);
            }
            ans += ch;
        }
        System.out.println(ans);
    }
}