easter gifts

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> gifts = Console.ReadLine().Split().ToList();

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

            while (command[0] != "No")
            {
                if (command[0] == "OutOfStock")
                {
                    for (int i = 0; i < gifts.Count; i++)
                    {
                        if (gifts[i].Equals(command[1]))
                        {
                            gifts[i] = "None";
                        }
                    }
                }
                if (command[0] == "Required")
                {
                    int index = int.Parse(command[2]);

                    if (index >= 0 && index < gifts.Count)
                    {
                        gifts[index] = command[1];
                    }
                }
                if (command[0] == "JustInCase")
                {
                    gifts[gifts.Count - 1] = command[1];
                }

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

            gifts.RemoveAll(x => x == "None");

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