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: Wrong Answer)

import java.util.Scanner;

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