02. Final

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

namespace NewSolution
{
    class Program
    {
        static void Main(string[] args)
        {
            var result = new Dictionary<string, List<string>>();

            while (true)
            {
                var input = Console.ReadLine();

                if (input == "END")
                {
                    break;
                }
                else
                {
                    var line = input.Split("->");

                    var command = line[0];
                    var store = line[1];

                    if (command == "Add")
                    {
                        if (!result.ContainsKey(store))
                        {
                            result.Add(store, new List<string>());

                            if (!line[2].Contains(','))
                            {
                                result[store].Add(line[2]);
                            }
                            else
                            {
                                var items = line[2].Split(',');
                                foreach (var item in items)
                                {
                                    result[store].Add(item);
                                }
                            }
                        }
                        else
                        {
                            if (!line[2].Contains(','))
                            {
                                result[store].Add(line[2]);
                            }
                            else
                            {
                                var items = line[2].Split(',');
                                foreach (var item in items)
                                {
                                    result[store].Add(item);
                                }
                            }
                        }
                    }
                    else if(command=="Remove")
                    {
                        if (result.ContainsKey(store))
                        {
                            result.Remove(store);
                        }
                    }
                }
            }

            Console.WriteLine("Stores list:");
            foreach (var item in result.OrderByDescending(x => x.Value.Count).ThenByDescending(x=>x.Key))
            {
                Console.WriteLine(item.Key);
                foreach (var items in item.Value)
                {
                    Console.WriteLine($"<<{items}>>");
                }
            }
        }
    }
}