asd

namespace _03.CitiesByContinentAndCountries
{
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Linq;

    public class Program
    {
        public static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            var myDict = new Dictionary<string, Dictionary<string, List<string>>>();

            for (int i = 0; i < n; i++)
            {

                string[] input = Console.ReadLine().Split(' ').ToArray();
                string continent = input[0];
                string country = input[1];
                string town = input[2];

                if (!myDict.ContainsKey(continent))
                {
                    myDict.Add(continent, new Dictionary<string, List<string>>());

                }

                if (!myDict[continent].ContainsKey(country))
                {
                    myDict[continent].Add(country, new List<string>());
                    myDict[continent][country].Add(town);
                }
            }
            string result = string.Join(Environment.NewLine,
                                        myDict.Select(kvp => $"{kvp.Key}, {kvp.Value.Select(v => $"{v.Key} -> {string.Join(", ", v.Value)}")}"));
            Console.WriteLine(result);
        }
    }
}