PasswordReset

package Exam;

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

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

        String text = scan.readLine();
        StringBuilder sb = new StringBuilder();

        String command;
        while (!"Done".equals(command = scan.readLine())) {
            String[] tokens = command.split("\\s");
            String currentCommand = tokens[0];
            switch (currentCommand) {
                case "TakeOdd":
                    text = takeOdd(text);
                    break;

                case "Cut":
                    String substring = text.substring(Integer.parseInt(tokens[1]), Integer.parseInt(tokens[1]) + Integer.parseInt(tokens[2]));
                    text = text.replaceFirst(substring, "");
                    break;

                case "Substitute":
                    if (text.contains(tokens[1])) {
                        text = text.replaceAll(tokens[1], tokens[2]);

                    } else {
                        System.out.println("Nothing to replace!");
                        continue;
                    }
                    break;
            }
            System.out.println(text);

        }
        System.out.printf("Your password is: %s\n", text);

    }

    private static String takeOdd(String text) {
        StringBuilder newText = new StringBuilder();
        for (int i = 0; i < text.length(); i++) {
            if (i % 2 != 0) {
                newText.append(String.valueOf(text.charAt(i)));
            }
        }
        return newText.toString();
    }
}