using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _04.Group_Continents__Countries_and_Cities
{
    class Program
    {
        static void Main(string[] args)
        {
            var continentData = new SortedDictionary<string, SortedDictionary<string, SortedSet<string>>>();
            var n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n; i++)
            {
                var tokens = Console.ReadLine().Split();
                var continent = tokens[0];
                var country = tokens[1];
                var city = tokens[2];

                if (!continentData.ContainsKey(continent))
                {
                    continentData.Add(continent, new SortedDictionary<string, SortedSet<string>>());
                    continentData[continent] = new SortedDictionary<string, SortedSet<string>>
                    {
                        {country, new SortedSet<string>()}
                    };
                }
                else
                {
                    if (!continentData[continent].ContainsKey(country))
                    {
                        continentData[continent].Add(country, new SortedSet<string>());
                    }
                }

                continentData[continent][country].Add(city);
            }

            foreach (var continentContries in continentData)
            {
                var continentName = continentContries.Key;
                var countries = continentContries.Value;

                Console.WriteLine($"{continentName}:");

                foreach (var countryCities in countries)
                {
                    var countryName = countryCities.Key;
                    var cities = countryCities.Value;
                    Console.WriteLine($"  {countryName} -> {string.Join(", ", cities)}");
                }
            }
        }
    }
}