ForceBook

import java.util.*;

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

        Map<String, List<String>> book = new LinkedHashMap<>();
        Map<String, String> users = new HashMap<>();

        while (true) {
            String input = sc.nextLine();

            if (input.equalsIgnoreCase("Lumpawaroo")) break;

            String side = "", user = "";

            if (input.contains(" | ")) {
                String[] inputValues = input.split(" \\| ");
                side = inputValues[0].trim();
                user = inputValues[1].trim();

                if (!users.containsKey(user)) {
                    users.put(user, side);

                    if (!book.containsKey(side)) {
                        book.put(side, new ArrayList<>());
                    }
                    book.get(side).add(user);
                }

            } else if (input.contains(" -> ")) {
                String[] inputValues = input.split(" -> ");
                side = inputValues[1].trim();
                user = inputValues[0].trim();

                if (users.containsKey(user)) {
                    String oldSide = users.remove(user);
                    book.get(oldSide).remove(user);
                    book.get(side).add(user);
                    users.put(user, side);
                } else {
                    users.put(user, side);
                    if (!book.containsKey(side)) {
                        book.put(side, new ArrayList<>());
                    }
                    book.get(side).add(user);
                }

                System.out.printf("%s joins the %s side!%n", user, side);
            }
        }
        sc.close();

        for (Map.Entry<String, List<String>> force : book.entrySet()) {
            if (force.getValue().size() > 0) {
                System.out.printf("Side: %s, Members: %s%n", force.getKey(), force.getValue().size());
                for (String user : force.getValue()) {
                    System.out.println("! " + user);
                }
            }
        }
    }
}