01. Warrior's Quest

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String string = scan.nextLine();

        String input = scan.nextLine();
        while (!"For Azeroth".equals(input)) {
            String[] tokens = input.split("\\s+");
            String command = tokens[0];

            switch (command) {
                case "GladiatorStance":
                    string = string.toUpperCase();
                    System.out.println(string);
                    break;
                case "DefensiveStance":
                    string = string.toLowerCase();
                    System.out.println(string);
                    break;
                case "Dispel":
                    int index = Integer.parseInt(tokens[1]);
                    char letter = tokens[2].charAt(0);
                    if (index >= 0 && index < string.length()) {
                        StringBuilder sb = new StringBuilder(string);
                        sb.setCharAt(index, letter);
                        string = sb.toString();
                        System.out.println("Success!");
                    } else {
                        System.out.println("Dispel too weak.");
                    }
                    break;
                case "Target":
                    if ("Change".equals(tokens[1])) {
                        String firstSubstr = tokens[2];
                        String secondsSubstr = tokens[3];
                        string = string.replace(firstSubstr, secondsSubstr);
                        System.out.println(string);
                    } else if ("Remove".equals(tokens[1])) {
                        String substring = tokens[2];
                        string = string.replace(substring, "");
                        System.out.println(string);
                    } else {
                        System.out.println("Command doesn't exist!");
                    }
                    break;
                default:
                    System.out.println("Command doesn't exist!");
            }

            input = scan.nextLine();
        }
    }
}