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

		char [] ch = str.toCharArray();
		for(int i=0;i<ch.length;++i){
			if (Character.isUpperCase(ch[i])){
				ch[i]=Character.toLowerCase(ch[i]);
			}else{
				ch[i]=Character.toUpperCase(ch[i]);
			}
		}
		System.out.println(new String(ch));
    }
}