O1. Secret Chat / FinalExam - O3

package FinalExam.O3;

import java.util.Scanner;

public class O1SecretChat {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder input = new StringBuilder(scanner.nextLine());
        String command = scanner.nextLine();

        while (!command.equals("Reveal")) {
            String[] type = command.split(":\\|:");
            switch (type[0]) {
                case "ChangeAll":
                    input = new StringBuilder(input.toString().replace(type[1], type[2]));
                    System.out.println(input);
                    break;
                case "Reverse":
                    if (input.toString().contains(type[1])) {

                        input.delete(input.indexOf(type[1]), input.indexOf(type[1]) + type[1].length())
                                .append(new StringBuilder(type[1]).reverse());

                        System.out.println(input);
                    } else {
                        System.out.println("error");
                    }
                    break;
                case "InsertSpace":
                    input.insert(Integer.parseInt(type[1]), " ");
                    System.out.println(input);
                    break;
            }
            command = scanner.nextLine();
        }
        System.out.println("You have a new text message: " + input);
    }
}