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.*;
import java.util.Arrays;
import java.util.Scanner;

public class Main{
	public static void main(String[] args){ 
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		char[] let = str.toCharArray();
		for (int i = 0 ; i<let.length ; i ++ ) {
			if (Character.isUpperCase(let[i])) {
				let[i] = Character.toLowerCase(let[i]);
			}else{
				let[i] = Character.toUpperCase(let[i]);
			}
			System.out.print(let[i]);
		}
	}
}