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){
  try(Scanner sc = new Scanner(System.in)){
   String line = sc.nextLine();
   String answer = "";
   int length = line.length();
   for(int i = 0;i < length;i++){
    char ch = line.charAt(i);
    if(Character.isLowerCase(ch)){
    answer += Character.toUpperCase(ch);
    }
    else{
    answer += Character.toLowerCase(ch);
    }
   }
   System.out.println(answer);
  }
 }
}