My Retake Mid Exam 17/08/2021 Problem 3

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;
                    }

                    input = Console.ReadLine();
                }

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

            }
        }
    }