My Retake Mid Exam 17/08/2021 Problem 2

using System;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection.Metadata.Ecma335;
using System.Runtime.ExceptionServices;
using System.Threading;
using System.Text.RegularExpressions;

namespace ConsoleApp24
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> biscuits = Console.ReadLine().Split(", ").ToList();
            string input = Console.ReadLine();

            while (input != "Eat")
            {
                string[] commands = input.Split();

                switch (commands[0])
                {
                    case "Update-Any":
                        for (int i = 0; i < biscuits.Count-1; i++)
                        {
                            if (biscuits[i] == commands[1])
                            {
                                string outOfStock = "Out of stock";
                                biscuits[i] = outOfStock;
                            }
                        }
                        break;
                    case "Replace":
                        int indexExtra = int.Parse(commands[2]);
                        string value = commands[1];
                        if (indexExtra >= 0 && indexExtra < biscuits.Count)
                        {
                            biscuits[indexExtra] = value;
                        }

                        break;
                    case "Update-Last":
                        string last = biscuits[biscuits.Count - 1];
                        biscuits.Remove(last);
                        biscuits.Add(commands[1]);

                        break;
                    case "Rearrange":
                        if (biscuits.Contains(commands[1]))
                        {
                            biscuits.Remove(commands[1]);
                            biscuits.Add(commands[1]);
                        }
                        break;
                }

                input = Console.ReadLine();
            }
            for (int i = 0; i < biscuits.Count; i++)
            {
                if (biscuits[i] == "Out of stock")
                {
                    biscuits.Remove("Out of stock");
                }
            }

                Console.WriteLine(string.Join(" ", biscuits));

        }
    }
}