NightLifeBook

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

class Program
{
    static void PrintTheNightBook(Dictionary<string, SortedDictionary<string, SortedSet<string>>> nightBook) // method to print the nightBook;
    {
        foreach (var town in nightBook)
        {
            Console.WriteLine(town.Key);
            foreach (var clubs in town.Value)
            {
                Console.Write(" --> {0}: {1}", clubs.Key, string.Join(", ", clubs.Value));
                Console.WriteLine();
            }
        }
    }
    static void Main()
    {
        Dictionary<string, SortedDictionary<string, SortedSet<string>>> nightBook = new Dictionary<string, SortedDictionary<string, SortedSet<string>>>();
        string input = Console.ReadLine();
        string city = string.Empty;
        string place = string.Empty;
        string performer = string.Empty;

        while (input != "END") //Fill out the NightBook;
        {
            var cityPlacePerformer = new List<string>(input.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries).ToList());
            city = cityPlacePerformer[0];
            place = cityPlacePerformer[1];
            performer = cityPlacePerformer[2];
            if (!nightBook.ContainsKey(city))
            {
                nightBook[city] = new SortedDictionary<string, SortedSet<string>>();
            }
            if (!nightBook[city].ContainsKey(place))
            {
                nightBook[city][place] = new SortedSet<string>();
            }
            nightBook[city][place].Add(performer);
            input = Console.ReadLine();
        }
        PrintTheNightBook(nightBook);
    }
}