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) {
		Scanner stdIn = new Scanner(System.in);
		//?????????????????????????????????
		stdIn.useDelimiter(System.getProperty("line.separator"));
		String word = stdIn.next();
		// ??????????????????????????§?°??????????
		// String?????????char????????????????????????????????????????????????
		char[] cw = word.toCharArray();
		for (int i = 0; i < cw.length; i++) {
			if (Character.isUpperCase(cw[i])) {
				cw[i] = Character.toLowerCase(cw[i]);
			} else {
				cw[i] = Character.toUpperCase(cw[i]);
			}
		}
		for (char charValue : cw) {
			System.out.print(charValue);
		}
		stdIn.close();
	}
}