static void Main(string[] args)
        {
            const string AddDossiser = "1";
            const string ShowAllDossiser = "2";
            const string RemoveDossiser = "3";
            const string SearchDossiser = "4";
            const string Exit = "5";

            string[] arrayFullNames = new string[0];
            string[] arrayPositions = new string[0];
            bool isExit = true;

            while (isExit)
            {
                Console.WriteLine("1) Добавить досье \n" +
                    "2) Вывести все досье \n" +
                    "3) Удалить досье \n" +
                    "4) Поиск по фамилии \n" +
                    "5) Выход");
                string input = Console.ReadLine();

                switch (input)
                {
                    case AddDossiser:
                        AddDossier(ref arrayFullNames, ref arrayPositions);
                        break;

                    case ShowAllDossiser:
                        ShowAllDossier(arrayFullNames, arrayPositions);
                        break;

                    case RemoveDossiser:
                        RemoveDossier(ref arrayFullNames, ref arrayPositions);
                        break;

                    case SearchDossiser:
                        SearchDossier(arrayFullNames, arrayPositions);
                        break;

                    case Exit:
                        isExit = false;
                        break;

                    default:
                        Console.WriteLine("Неверный код");
                        break;
                }

                Console.WriteLine("");
            }
        }

        private static void AddDossier(ref string[] arrayFullNames, ref string[] arrayPositions)
        {
            Console.WriteLine("Введите ФИО.");
            string fullname = Console.ReadLine();
            Console.WriteLine("Введите Должность");
            string post = Console.ReadLine();

            arrayFullNames = IncreasArray(arrayFullNames, fullname);
            arrayPositions = IncreasArray(arrayPositions, post);
        }

        private static string[] IncreasArray(string[] array, string inputText)
        {
            string[] tempArray = new string[array.Length + 1];

            for (int i = 0; i < array.Length; i++)
            {
                tempArray[i] = array[i];
            }

            tempArray[array.Length] = inputText;
            return tempArray;
        }

        private static void RemoveDossier(ref string[] arrayFullNames, ref string[] arrayPositions)
        {
            Console.WriteLine("Введите индекс досье");

            if (int.TryParse(Console.ReadLine(), out int result))
            {
                int index = result - 1;
                int arrayLength = arrayFullNames.Length;

                if (index >= 0 && arrayFullNames.Length > index)
                {
                    arrayFullNames = DecreaseArray(arrayFullNames, index);
                    arrayPositions = DecreaseArray(arrayPositions, index);
                    return;
                }
            }

            Console.WriteLine("Неверный индекc");
        }

        private static string[] DecreaseArray(string[] array, int index)
        {
            string[] tempArray = new string[array.Length - 1];

            for (int i = 0; i < index; i++)
            {
                tempArray[i] = array[i];
            }

            for (int i = index; i < tempArray.Length; i++)
            {
                tempArray[i] = array[i + 1];
            }

            return tempArray;
        }

        private static void ShowAllDossier(string[] arrayFIO, string[] arrayPost)
        {
            int index = 1;
            for (int i = 0; i < arrayFIO.Length; i++)
            {
                Console.WriteLine($"{index}) {arrayFIO[i]} - {arrayPost[i]}");
                index++;
            }
        }

        private static void SearchDossier(string[] arrayFIO, string[] arrayPost)
        {
            Console.WriteLine("Введите фамилию");
            string lastName = Console.ReadLine();
            int index = 1;

            for (int i = 0; i < arrayFIO.Length; i++)
            {
                var split = arrayFIO[i].Split(" ");

                if (split[0].ToLower() == lastName.ToLower())
                {
                    Console.WriteLine($"{index}) {arrayFIO[i]} - {arrayPost[i]}");
                    return;
                }

                index++;
            }
        }