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 static java.lang.System.out;                                    
import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String[] strs = scan.nextLine().split("");
        Pattern upper = Pattern.compile("[a-z]");
        Pattern lower = Pattern.compile("[A-Z]");
        for(String str : strs) {
            Matcher mUpper = upper.matcher(str);
            Matcher mLower = lower.matcher(str);
            if (mUpper.find()) {
                out.print(str.toUpperCase());
            } else if(mLower.find()) {
                out.print(str.toLowerCase());
            }
        }
        out.println();
    }
}