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);
		String str = sc.nextLine();
		String ans = "";
		for (int i = 0; i < str.length(); ++i) {
			char ch = str.charAt(i);
			if ('A' <= ch && ch <= 'Z')
				ans += (char)(ch - ('A' - 'a'));
			else if ('a' <= ch && ch <= 'z')
				ans += (char)(ch + ('A' - 'a'));
			else
				ans += ch;
		}
		System.out.println(ans);
	}
}