neshto [Mimi]

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class _09_ForceBook {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        Map<String, List<String>> sidesWithUsers = new TreeMap<>();

        String input = "";
        while (!"Lumpawaroo".equals(input = reader.readLine())) {

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

                boolean exists = false;
                sidesWithUsers.putIfAbsent(side, new ArrayList<>());
                for (Map.Entry<String, List<String>> pair : sidesWithUsers.entrySet()) {
                    List<String> users = pair.getValue();
                    if (users.contains(user)) {
                        exists = true;
                        break;
                    }
                }

                if (!exists) {
                    sidesWithUsers.get(side).add(user);
                }

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

                sidesWithUsers.putIfAbsent(side, new ArrayList<>());

                for (Map.Entry<String, List<String>> pair : sidesWithUsers.entrySet()) {
                    List<String> users = pair.getValue();
                    if (users.contains(user)) {
                        users.remove(user);
                        break;
                    }
                }

                sidesWithUsers.get(side).add(user);
                System.out.println(user + " joins the " + side + " side!");
            }
        }

        sidesWithUsers.entrySet().stream()
                .sorted((v1, v2) -> Integer.compare(v2.getValue().size(), v1.getValue().size()))
                .filter(e -> e.getValue().size() > 0)
                .forEach(kvp -> {
                    System.out.println("Side: " + kvp.getKey() + ", " + "Members: " + kvp.getValue().size());
                    Collections.sort(kvp.getValue());
                    kvp.getValue().forEach(user -> {
                        System.out.println("! " + user);
                    });
                });
    }
}