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.*;

public class Main{
    public static void main(String[] args) {
      // 標準入力からデータを読み込む準備
      try (Scanner sc = new Scanner(System.in)) { String line = sc.nextLine();
      String answer = "";
      String tmp;
      int length = line.length();
      for (int i = 0; i < length; i++) {
      char ch = line.charAt(i);
      if(Character.isLowerCase(ch) == true){
        
        ch = Character.toUpperCase(ch);
        tmp = String.valueOf(ch);
        answer = answer + tmp;
      }else{
        ch = Character.toLowerCase(ch);
          tmp = String.valueOf(ch);
        answer = answer + tmp;
      }
    }
    System.out.println(answer);
  }
}
}