using System;

namespace ConsoleApp3
{
    public interface aaa { public void am(string s); }
    public interface bbb { public void bm(string s); }
    public interface ccc : aaa, bbb { public void cm(string s); }
    public class ddd : ccc
    {
        public void am(string s) { Console.WriteLine("am "+s); }
        public void bm(string s) { Console.WriteLine("bm " + s); }
        public void cm(string s) { Console.WriteLine("cm " + s); }
        public void dm(string s) { Console.WriteLine("dm " + s); }
    }

    public class eee: ddd
    {
        public void em(string s) { Console.WriteLine("em " + s); }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ddd myDdd = new ddd();
            myDdd.am("book");
            myDdd.bm("house");
            myDdd.cm("duck");
            myDdd.dm("cat");

            eee mYeee = new eee();
            //mYeee.
        }
    }
}