My Problem 3 (Mid Exam 10/07/2021)

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> products= Console.ReadLine().Split("|").ToList();
            string input = Console.ReadLine();

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

                switch (commands[0])
                {
                    case "Important":
                        if (products.Contains(commands[1]))
                        {
                            products.Remove(commands[1]);
                            products.Insert(0, commands[1]);
                        }
                        else
                        {
                            products.Insert(0, commands[1]);
                        }
                        break;
                    case "Add":
                        if (!products.Contains(commands[1]))
                        {
                            products.Add(commands[1]);
                        }
                        else
                        {
                            Console.WriteLine("The product is already in the list");
                        }
                        break;
                    case "Swap":

                        if (!products.Contains(commands[1]))
                        {
                            Console.WriteLine($"Product {commands[1]} missing!");
                        }
                        else if (!products.Contains(commands[2]))
                        {
                            Console.WriteLine($"Product {commands[2]} missing!");
                        }
                        else
                        {
                            int index1 = products.IndexOf(commands[1]);
                            int index2 = products.IndexOf(commands[2]);
                            string temp = products[index1];
                            products[index1] = products[index2];
                            products[index2] = temp;
                        }

                        break;
                    case "Remove":
                        if (products.Contains(commands[1]))
                        {
                            products.Remove(commands[1]);
                        }
                        else
                        {
                            Console.WriteLine($"Product {commands[1]} isn't in the list.");
                        }
                        break;
                    case "Reverse":
                        products.Reverse();
                        break;
                }

                input = Console.ReadLine();
            }

            for (int i = 0; i < products.Count; i++)
            {
                Console.WriteLine($"{i+1}. {products[i]}");
            }

        }
    }
}