static void Main(string[] args)
        {
            Apple apple1 = new Apple {
                Taste = "Sweet", VitaminsAmount = 20
            };
            Apple apple2 = new Apple {
                Taste = "Sweet", VitaminsAmount = 19
            };
            Apple apple3 = new Apple {
                Taste = "Sweet", VitaminsAmount = 21
            };
            Orange orange1 = new Orange {
                Taste = "Sweet/Sour", VitaminsAmount = 17
            };
            Orange orange2 = new Orange {
                Taste = "Sweet/Sour", VitaminsAmount = 19
            };
            Steak steakSoDiploma = new Steak {
                Taste = "Salty", ProteinsAmount = 40
            };
            Egg egg1 = new Egg {
                Taste = "Salty", ProteinsAmount = 30
            };

            //List<Apple> apples = new List<Apple> { apple1, apple2, apple3, new JapanApple { JapanProperty = 2 } };
            //List<Orange> oranges = new List<Orange> { orange1, orange2 };
            //List<Egg> eggs = new List<Egg> { egg1 };
            //List<Steak> steaks = new List<Steak> { steakSoDiploma };

            List <IJucable> jucables = new List <IJucable> {
                apple1, apple2, apple3, orange1, orange2
            };
            List <IProtein> proteins = new List <IProtein> {
                steakSoDiploma, egg1
            };

            List <IFood> foods = new List <IFood> {
                apple1, apple2, apple3, orange1, orange2, steakSoDiploma, egg1
            };

            foods.Select(x => x.Taste);

            GenericDb <Apple>  appleDb  = new GenericDb <Apple>();
            GenericDb <Orange> orangeDb = new GenericDb <Orange>();
            GenericDb <Steak>  steakDb  = new GenericDb <Steak>();
            GenericDb <Egg>    eggDb    = new GenericDb <Egg>();

            //GenericDb<string> stringDb = new GenericDb<string>();

            //appleDb appleDb1 = new appleDb()

            appleDb.AddItem(apple1);
            appleDb.AddItem(apple2);
            appleDb.AddItem(apple3);
            orangeDb.AddItem(orange1);
            orangeDb.AddItem(orange2);
            steakDb.AddItem(steakSoDiploma);
            eggDb.AddItem(egg1);


            List <Apple>  apples  = appleDb.GetItems();
            List <Orange> oranges = orangeDb.GetItems();
            List <Egg>    eggs    = eggDb.GetItems();
            List <Steak>  steaks  = steakDb.GetItems();



            Console.WriteLine("Choose 1. Juces 2. Proteins 3. All Food");
            string answer = Console.ReadLine();

            if (int.Parse(answer) == 1)
            {
                //foreach (var apple in apples)
                //{
                //    Console.WriteLine();
                //}

                //foreach (var orange in oranges)
                //{
                //    Console.WriteLine();
                //}

                foreach (var juicable in jucables)
                {
                    Console.WriteLine();
                }
            }
            else if (StrToInt(answer) == 2)
            {
                //foreach (var steak in steaks)
                //{
                //    Console.WriteLine();
                //}

                //foreach (var egg in eggs)
                //{
                //    Console.WriteLine();
                //}

                foreach (var protein in proteins)
                {
                    Console.WriteLine();
                }
            }
            else if (answer.ToInt() == 3)
            {
                //foreach (var jucable in jucables)
                //{
                //    Console.WriteLine();
                //}

                //foreach (var protein in proteins)
                //{
                //    Console.WriteLine();
                //}

                foreach (var food in foods)
                {
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("Wrong input");
            }

            Console.ReadKey();
        }