treasure hunt

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading;

namespace ConsoleApp1
{
    class Exam
    {
        static void Main(string[] args)
        {

            List<string> treasure = Console.ReadLine().Split('|').ToList();

            string[] command = Console.ReadLine().Split().ToArray();

            double sum = 0;

            while (command[0] != "Yohoho!")
            {
                if (command[0] == "Loot")
                {
                    for (int i = 1; i < command.Length; i++)
                    {
                        if (!treasure.Contains(command[i]))
                        {
                            treasure.Insert(0, command[i]);
                        }
                    }
                }
                if (command[0] == "Drop")
                {
                    int index = int.Parse(command[1]);

                    if (index >= 0 && index < treasure.Count)
                    {
                        string temp = treasure[index];

                        treasure.RemoveAt(index);

                        treasure.Add(temp);
                    }
                }
                if (command[0] == "Steal")
                {
                    int count = int.Parse(command[1]);
                    int lastIndex = treasure.Count - 1;

                    List<string> stealed = new List<string>();
                    if (count > treasure.Count)
                    {
                        count = treasure.Count;
                    }
                    for (int i = 0; i < count; i++)
                    {

                        stealed.Add(treasure[treasure.Count - 1]);
                        treasure.Remove(treasure[treasure.Count - 1]);

                    }
                    stealed.Reverse();
                    Console.WriteLine(string.Join(", ", stealed));
                }

                command = Console.ReadLine().Split().ToArray();
            }

            if (treasure.Count == 0)
            {
                Console.WriteLine("Failed treasure hunt.");
            }
            else
            {

                for (int i = 0; i < treasure.Count; i++)
                {
                    string word = treasure[i];

                    int lenght = word.Length;

                    sum += lenght;
                }

                double average = sum / treasure.Count * 1.0;

                Console.WriteLine($"Average treasure gain: {average:F2} pirate credits.");
            }
        }
    }
}