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.*;

public class Main {
    public static void main(String[] args) throws Exception {
        int i,j;
        
        Scanner sc=new Scanner(System.in);
        
        String str;
        Character c;
        while(true){
            try{
                str=sc.next();
                for(i=0;i<str.length();i++){
                    c=str.charAt(i);
                    if(Character.isUpperCase(c))System.out.printf("%c",Character.toLowerCase(c));
                    else if(Character.isLowerCase(c))System.out.printf("%c",Character.toUpperCase(c));
                    else System.out.printf("%c",c);
                }
                System.out.printf(" ");
            }catch(NoSuchElementException e){
                break;
            }
        }
    }
}