02. SoftUni Karaoke

using System;
using System.Linq;
using System.Collections.Generic;

namespace SoftUniKaraoke
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> participants = Console.ReadLine().Split(", ").ToList();
            List<string> songs = Console.ReadLine().Split(", ").ToList();

            var info = new Dictionary<string, SortedSet<string>>();

            string command;
            while ((command = Console.ReadLine()) != "dawn")
            {
                string[] tokens = command.Split(", ");
                string participant = tokens[0], song = tokens[1], award = tokens[2];

                if (participants.Contains(participant) && songs.Contains(song))
                {
                    if (!info.ContainsKey(participant))
                    {
                        info[participant] = new SortedSet<string>();
                    }
                    info[participant].Add(award);
                }
            }

            if (info.Count > 0)
            {
                foreach (var i in info.OrderByDescending(x => x.Value.Count).ThenBy(x => x.Key))
                {
                    Console.WriteLine($"{i.Key}: {i.Value.Count} awards\n--" + String.Join("\n--", i.Value));
                }
            }
            else
            {
                Console.WriteLine("No awards");
            }
        }
    }
}