using System;

​

namespace Cities_and_Villages

{

    abstract class Toponym

    {

        public string name

        {

            private set { name = value; }

            get { return name; }

        }

        private DateTime foundationDate

        {

            set { foundationDate = value; }

            get { return foundationDate; }

        }

        public static int GetAge(DateTime foundationDate)

        {

            return foundationDate.Year - DateTime.Now.Year;

        }

    }

   interface IToponym

    {

        int population { get; set; }    

    }

    public interface ICity

    {

​

    }

    public interface IVillage

    {

​

    }

    class City : Toponym, IToponym, ICity

    {

​

        City city = new City(string name, DateTime foundationDate)

        {

            this.name = name;

            this.foundationDate = foundationDate;

        }

        public int population

        {

            private set { }

            get {}

        }

        class Village : Toponym, IToponym, IVillage

        {

​

        }

        class Programm

        {

            static void Main(string[] args)

            {

                City a = new City();

                name = "Dnipro";

            }

        }

    }

}

​