tank collector

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> tanks = Console.ReadLine().Split(", ").ToList();

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


            for (int i = 0; i < inputs; i++)
            {
                string[] command = Console.ReadLine().Split(", ").ToArray();
                if (command[0] == "Add")
                {
                    string machine = command[1];

                    if (tanks.Contains(machine))
                    {
                        Console.WriteLine("Tank is already bought");
                    }
                    else
                    {
                        tanks.Add(machine);
                        Console.WriteLine("Tank successfully bought");
                    }
                }
                else if (command[0] == "Remove")
                {
                    string machine = command[1];

                    if (tanks.Contains(machine))
                    {
                        tanks.Remove(machine);
                        Console.WriteLine("Tank successfully sold");
                    }
                    else
                    {
                        Console.WriteLine("Tank not found");
                    }
                }
                else if (command[0] == "Remove At")
                {
                    int index = int.Parse(command[1]);

                    if (index >= 0 && index < tanks.Count)
                    {
                        tanks.RemoveAt(index);
                        Console.WriteLine("Tank successfully sold");
                    }
                    else
                    {
                        Console.WriteLine("Index out of range");
                    }
                }
                else if (command[0] == "Insert")
                {
                    int index = int.Parse(command[1]);
                    string machine = command[2];

                    if (index >= 0 && index < tanks.Count)
                    {
                        if (tanks.Contains(machine))
                        {
                            Console.WriteLine("Tank is already bought");
                        }
                        else
                        {
                            tanks.Insert(index, machine);
                            Console.WriteLine("Tank successfully bought");
                        }
                    }
                    else
                    {
                        Console.WriteLine("Index out of range");
                    }
                }


            }

            Console.WriteLine(string.Join(", ", tanks));
        }
    }
}