// https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/collections

​

using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

​

        var items = new List<string> {};

        Console.WriteLine("Add an item: ");

        var r1 = Console.ReadLine();

        items.Add(r1);

​

        foreach (var item in items) 

        {

            Console.Write(item);    

        }

    }

}