04. Star Enigma

using System;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;

namespace StarEnigma
{
    class Program
    {
        static void Main(string[] args)
        {
            Regex pattern = new Regex(@"@(?<name>[A-Za-z]+)[^@\-!:>]*:(?<population>\d+)[^@\-!:>]*!(?<type>A|D)![^@\-!:>]*->(?<soldiers>\d+)");
            var attackedPlanets = new List<string>();
            var destroyedPlanets = new List<string>();

            int countPlanets = int.Parse(Console.ReadLine());

            for (int i = 0; i < countPlanets; i++)
            {
                string message = Console.ReadLine();

                int starLen = new Regex(@"[STARstar]")
                    .Matches(message)
                    .Select(x => x.Value)
                    .Count();

                var decodedMessage = new StringBuilder();

                for (int j = 0; j < message.Length; j++)
                {
                    decodedMessage.Append((char)(message[j] - starLen));
                }

                if (pattern.IsMatch(decodedMessage.ToString()))
                {
                    var planet = pattern.Match(decodedMessage.ToString());

                    if (planet.Groups["type"].Value == "A")
                    {
                        attackedPlanets.Add(planet.Groups["name"].Value);
                    }
                    else
                    {
                        destroyedPlanets.Add(planet.Groups["name"].Value);
                    }
                }
            }

            Console.WriteLine($"Attacked planets: {(attackedPlanets.Count() > 0 ? attackedPlanets.Count() : 0)}");

            attackedPlanets.Sort();

            foreach (var planetName in attackedPlanets)
            {
                Console.WriteLine($"-> {planetName}");
            }

            Console.WriteLine($"Destroyed planets: {(destroyedPlanets.Count() > 0 ? destroyedPlanets.Count() : 0)}");

            destroyedPlanets.Sort();

            foreach (var planetName in destroyedPlanets)
            {
                Console.WriteLine($"-> {planetName}");
            }
        }
    }
}