using System;

using System.Collections.Generic;       

​

internal class Program

{

    static void Main(string[] args)

    {

        ShopKeeper poorShopKeeper = new ShopKeeper();

​

        Console.WriteLine(poorShopKeeper.GetWares().Count);

​

        Mugger.Mug(poorShopKeeper);

​

        Console.WriteLine(poorShopKeeper.GetWares().Count);

        Console.ReadLine();

    }

​

    public static class Mugger

    {

        public static void Mug(ShopKeeper target)

        {

            target.GetWares().RemoveAll(x => true);

        }

    }

​

​

    public class ShopKeeper

    {

        private List<string> Wares = new List<string>() { "Food", "Sword" };

​

        public string BuyWare(string item, int coin)

        {

            Wares.Remove(item);

            return item;

        }

​

        public List<string> GetWares()

        {

            return Wares;

        }

    }

}