namespace struct_dictionary
{
    class Dctnr {
        int num = 0;
        Dictionary<int, string> wishes = new Dictionary<int, string>();
        public void addingEl(string str) {
            num += 1;
            wishes.Add(num, str);
        }
        public void removingEl(int key) {
            if (key > 0)
            {
                wishes.Remove(key);
            }
            else {
                Console.WriteLine("You've written an inappropriate number");
            }
        }
        public void showingEl() {
            foreach (int i in wishes.Keys) {
                Console.WriteLine(i + " " + wishes[i]);
            }
        }
        public void countingEl() {
            int count = wishes.Count();
            Console.WriteLine(count);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.ForegroundColor = ConsoleColor.Yellow;
            Console.WriteLine("The dictionary of wishes");
            Console.ResetColor();

            Console.WriteLine("Please enter an appropriate number where:" +
                   "\n 1 - adding one new element to the dictionary;" +
                   "\n 2 - removing one element from the dictionary;" +
                   "\n 3 - showing all the elements of the dictionary;" +
                   "\n 4 - counting all the elements of the dictionary.");

            Dctnr dctnr = new Dctnr();

            while (true)
            {
                int choice = Convert.ToInt32(Console.ReadLine());
                switch (choice)
                {
                    case 1:
                        Console.WriteLine("Please, input the new wish");
                        dctnr.addingEl(Console.ReadLine());
                        break;

                    case 2:
                        Console.WriteLine("Please, input the number of the wish");
                        dctnr.removingEl(Convert.ToInt32(Console.ReadLine()));
                        break;

                    case 3:
                        dctnr.showingEl();
                        break;

                    case 4:
                        dctnr.countingEl();
                        break;

                    default:
                        Console.WriteLine("unknown command; try again");
                        break;
                }
            }
            Console.ReadKey();
        }
    }
}