Untitled

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;

public class JudgeExercise_09 {

    public static void printingMap(LinkedHashMap<String, ArrayList<String>> map) {
        for (Map.Entry<String, ArrayList<String>> entry : map.entrySet()) {
            String forceSide = entry.getKey();
            int numberOfUsers = entry.getValue().size();
            if (numberOfUsers > 0) {
                System.out.printf("Side: %s, Members: %d\n", forceSide, numberOfUsers);
                printingList(entry.getValue());
            }
        }
    }

    public static void printingList(ArrayList<String> users) {
        for (String user : users) {
            System.out.printf("! %s\n", user);
        }
    }

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        LinkedHashMap<String, String> usersAndSides = new LinkedHashMap<>();
        LinkedHashMap<String, ArrayList<String>> forceBook = new LinkedHashMap<>();

        while (true) {
            String text = sc.nextLine();
            if (text.equals("Lumpawaroo")) break;


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

                if (!usersAndSides.containsKey(user)) {
                    usersAndSides.put(user, side);
                } else continue;

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

            if (text.contains("->")) {
                String[] textParts = text.split(" -> ");
                String user = textParts[0].trim();
                String side = textParts[1].trim();

                if (!usersAndSides.containsKey(user) && !forceBook.containsKey(side)) {
                    usersAndSides.put(user, side);
                    forceBook.put(side, new ArrayList<>());
                    forceBook.get(side).add(user);
                }
                if (!usersAndSides.containsKey(user)) {
                    usersAndSides.put(user, side);
                    forceBook.get(side).add(user);
                } else {
                    String holder = usersAndSides.get(user);
                    usersAndSides.replace(user, side);
                    forceBook.get(side).add(user);
                    forceBook.get(holder).remove(user);
                }

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

            }
        }
        printingMap(forceBook);
    }
}