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: Accepted)

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		for (; sc.hasNext();) {
			char[] swap = sc.nextLine().toCharArray();
			//  char[] swap = scan.next().toCharArray();    //char型の配列に格納する
			for (int i = 0; i < swap.length; i++) {
				if (Character.isUpperCase(swap[i])) { //大文字の場合
					swap[i] = Character.toLowerCase(swap[i]);
				} else if (Character.isLowerCase(swap[i])) { //小文字の場合
					swap[i] = Character.toUpperCase(swap[i]);
				} else {
					//swap[i];
				}
			}
			StringBuffer sb = new StringBuffer(new String(swap));
			System.out.print(sb.toString());
			System.out.println();
		}

	}

}