Inventory

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

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

        List<String> inventory = Arrays
                .stream(scanner.nextLine().split(", "))
                .collect(Collectors.toList());

        String input = scanner.nextLine();

        while (!"Craft!".equals(input)) {
            String[] data = input.split(" - ");
            String command = data[0];
            String item = data[1];
            int token = inventory.indexOf(item);

            switch (command) {
                case "Collect":
                    if (inventory.contains(item)) {
                        break;
                    } else if (token < 0) {
                        inventory.add(item);
                    }
                    break;
                case "Drop":
                    if (0 <= token && token < inventory.size()) {
                        inventory.remove(item);
                    }
                    break;
                case "Combine Items":
                    String[] combineItems = item.split(":");
                    String oldItem = combineItems[0];
                    String newItem = combineItems[1];

                    token = inventory.indexOf(oldItem) + 1;
                    if (inventory.contains(oldItem)) {
                        inventory.add(token, newItem);
                    }
                    break;
                case "Renew":
                    if (inventory.contains(item) && 0 <= token && token < inventory.size()) {
                        inventory.remove(item);
                        inventory.add(item);
                    }
                    break;
                default:
                    break;
            }
            input = scanner.nextLine();
        }
        System.out.println(inventory.toString().replaceAll("[\\[\\]]", ""));
    }
}