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: Wrong Answer)

import java.io.*;

class Main{
  public static void main(String[] args) throws IOException{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringBuilder sb = new StringBuilder();

    char[] ch = br.readLine().toCharArray();
    for(char c : ch){
      String s = String.valueOf(c);
      if (c < 'a')
      sb.append(s.toLowerCase());
      else if(c > 'a')
      sb.append(s.toUpperCase());
    }
    System.out.println(sb);
  }
}