namespace  lab5
{
   abstract class person
    {
        string pri_name;
        string pri_surname;
        static ArrayList list=new ArrayList();
        public string name
        {
            get { return pri_name;}
            set { pri_name = value; }
        }
        public string surname
        {
            get { return pri_surname; }
            set { pri_surname = value; }
        }
        public person(string name, string surname)
        { 
            pri_name=name;
            pri_surname = surname;
            list.Add(this);
        }
        public person()
        {
            Console.WriteLine("constructor person class\n");
        }
       public void add()
       {
           list.Add(this);
       }
       public abstract  void show();
       public static void show_list()
       {
           foreach (person i in list)
           {
               Console.WriteLine(i);
           }
       }
       override public string ToString()
       { 
           return (name+"  "+surname+"\n");
       }
    }
}