JF-Maps-Exercise-08.CompanyUsers

import java.util.*;

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

        TreeMap<String, List<String>> users = new TreeMap<>();

        String input = sc.nextLine();

        while (!input.toLowerCase().equals("end")) {
            String[] tokens = input.split(" -> ");
            String company = tokens[0];
            String id = tokens[1];

            users.putIfAbsent(company, new ArrayList<>());

                if (!users.get(company).contains(id)) {
                    users.get(company).add(id);
                }

            input = sc.nextLine();
        }

        users.entrySet().stream()
                .forEach(e -> {
                    System.out.println(e.getKey());
                    e.getValue().forEach(a -> System.out.println("-- " + a));
                });
    }
}