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;

class Main {
    
    public static void main(String[] args) {
    	Scanner sc = new Scanner(System.in);
    	
    	int i;
    	String str = "null";
    	char result[];
    	
    	while(str.charAt(str.length()-1) != '.') {
    		str = sc.next();
        	result = new char[str.length()];
        	
        	for(i = 0; i < str.length(); i++) {
        		if(Character.isUpperCase(str.charAt(i))) {
        			result[i] = Character.toLowerCase(str.charAt(i));
        		} else {
        			result[i] = Character.toUpperCase(str.charAt(i));
        		}
        	}
        	for(i = 0; i < str.length(); i++) {
        		System.out.print(result[i]);
        	}
        	System.out.print(" ");
    	}
    	
    }
}