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.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String[] args) throws IOException{
    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    	String input = br.readLine();
    	char [] c = input.toCharArray();
    	for(int i = 0;i <c.length; i++){
    		if(Character.isUpperCase(c[i])){
    			c[i] = Character.toLowerCase(c[i]);
    		}
    		else if(Character.isLowerCase(c[i])){
    			c[i] = Character.toUpperCase(c[i]);
    		}
    		else{
    			c[i] = c[i];
    		}
    	}
    	for(int i =0;i < c.length;i++){
    		System.out.print(c[i]);
    	}
    }
}