Hogwarts

package Hogwarts;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Hogwarts {
    public static void main(String[] args) throws IOException {
        BufferedReader scanner = new BufferedReader(new InputStreamReader(System.in));


        StringBuilder text = new StringBuilder(scanner.readLine());


        String command;
        while (!"Abracadabra".equals(command = scanner.readLine())) {
            String[] tokens = command.split("\\s+");
            String currentCommand = tokens[0];

            if (currentCommand.equals("Abjuration")) {
                text = new StringBuilder(text.toString().toUpperCase());
                System.out.println(text);

            } else if (currentCommand.equals("Necromancy")) {
                text = new StringBuilder(text.toString().toLowerCase());
                System.out.println(text);

            } else if (currentCommand.equals("Illusion")) {
                int index = Integer.parseInt(tokens[1]);
                if (index < 0 || index > text.length() - 1) {
                    System.out.println("The spell was too weak.");

                } else {
                    text.replace(index, index + 1, tokens[2]);
                    System.out.println("Done!");
                }

            } else if (currentCommand.equals("Divination")) {
                if (text.toString().contains(tokens[1])) {
                    while (text.toString().contains(tokens[1])) {
                        text = new StringBuilder(text.toString().replace(tokens[1], tokens[2]));
                    }
                    System.out.println(text);
                }

            } else if (currentCommand.equals("Alteration")) {
                if (text.toString().contains(tokens[1])) {
                    text = new StringBuilder(text.toString().replace(tokens[1], ""));
                    System.out.println(text);

                }
            } else {
                System.out.println("The spell did not work!");
            }
        }
    }
}