using System;

using System.Collections.Generic;

​

namespace Classmates

{

    class Program

    {

        static void Main(string[] args)

        {

            var names = new List<string>();

​

            Console.WriteLine("Enter names/done");

            string input = Console.ReadLine();

​

            while (input != "done")

            {

                names.Add(input);

                input = Console.ReadLine();

            }

            Console.WriteLine("---------------");

            for (int i = 0; i < names.Count; i++)

            {

                Console.WriteLine($"{i} - {names[i]}");

            }

            Console.WriteLine("---------------");

​

​

            Console.WriteLine("Enter index to remove/done");

            string input2 = Console.ReadLine();

​

            while (input2 != "done")

            {

                int index = int.Parse(input2);

                names.RemoveAt(index);

                Console.WriteLine("---------------");

                for (int i = 0; i < names.Count; i++)

                {

                    Console.WriteLine($"{i} - {names[i]}");

                }

​

                Console.WriteLine("---------------");

                Console.WriteLine("Enter index to remove/done");

                input2 = Console.ReadLine();

            }

            Console.WriteLine("---------------");

            Console.WriteLine("Add name of a classmate of another group");

            string input3 = Console.ReadLine();

            names.Insert(0, input3);

            for (int i = 0; i < names.Count; i++)

            {

                Console.Write($"{i} - {names[i]}, ");

            }

            Console.WriteLine();

            Console.WriteLine("---------------");

            Console.Write("Enter your name: ");

            string yourName = Console.ReadLine();

            Console.WriteLine("---------------");

​

            if (!names.Contains(yourName))

            {

                names.Add(yourName);

            }

            names.Sort();

            for (int i = 0; i < names.Count; i++)

            {

                Console.Write($"{i} - {names[i]}, ");

            }

        }

    }

}

​