using System;

public class Program

{

​

​

    interface ISayYourName

    {

        string DisplayName();

    }

    public class Cat : ISayYourName

    {

        private string Name = "Mruczek";

        public string DisplayName() 

        {

            return Name;

        }

    }

    public static void Main()

    {

​

    }

}