Cities by Continent and Country /lab/

import java.util.*;
import java.util.stream.Collectors;

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

        int count = Integer.parseInt(scanner.nextLine());
        Map<String, Map<String, List<String>>> map = new LinkedHashMap<>();

        for (int i = 0; i < count; i++) {
            String[] line = scanner.nextLine().split("\\s+");
            String continets = line[0];
            String country = line[1];
            String cities = line[2];
            if (!map.containsKey(continets)) {
                map.put(continets, new LinkedHashMap<>());
                map.get(continets).put(country, new ArrayList<>());
                map.get(continets).get(country).add(cities);
            } else if (!map.get(continets).containsKey(country)) {
                map.get(continets).put(country, new ArrayList<>());
                map.get(continets).get(country).add(cities);
            } else {
                map.get(continets).get(country).add(cities);
            }
        }

        for (Map.Entry<String, Map<String, List<String>>> entry : map.entrySet()) {
            System.out.printf("%s:%n", entry.getKey());
            for (Map.Entry<String, List<String>> a : entry.getValue().entrySet()) {
                System.out.printf("  %s -> ", a.getKey());
                for (int i = 0; i < a.getValue().size(); i++) {
                    if (i == a.getValue().size() - 1) {
                        System.out.println(a.getValue().get(i));
                    } else {
                        System.out.print(a.getValue().get(i) + ", ");
                    }
                }
            }
        }
    }
}