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: WA: Presentation Error)

import java.util.Scanner;

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

    }
}