Treasure Hunt

import java.util.*;
import java.util.stream.Collectors;

public class TreasureHunt {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        List<String> loot = Arrays
                .stream(scanner.nextLine().split("\\|"))
                .collect(Collectors.toList());

        String input = scanner.nextLine();
        while (!"Yohoho!".equals(input)) {
            List<String> treasure = Arrays
                    .stream(input.split("\\s+"))
                    .collect(Collectors.toList());
            String command = treasure.get(0);

            switch (command) {
                case "Loot":
                    for (int i = 1; i < treasure.size(); i++) {
                        if (!loot.contains(treasure.get(i))) {
                            loot.add(0, treasure.get(i));
                        }
                    }
                    break;
                case "Drop":
                    int dropIndex = Integer.parseInt(treasure.get(1));

                    if (dropIndex >= 0 && dropIndex < loot.size()) {
                        String item = loot.get(dropIndex);
                        loot.remove(dropIndex);
                        loot.add(item);
                    }
                    break;
                case "Steal":
                    int count = Integer.parseInt(treasure.get(1));
                    if (count > loot.size()) {
                        count = loot.size();
                    }
                    List<String> subList = loot.subList(loot.size() - count, loot.size());

                    System.out.println(String.join(", ", subList));

                    loot = loot.subList(0, loot.size() - count);
                    break;
            }
            input = scanner.nextLine();
        }
        if (!loot.isEmpty()) {
            double sum = 0;
            for (String counter : loot) {
                sum += counter.length();
            }
            double averageSum = sum / loot.size();

            System.out.printf("Average treasure gain: %.2f pirate credits.%n", averageSum);
        } else {
            System.out.println("Failed treasure hunt.");
        }
    }
}