/* -------------- FÜR CS ----------------------------------------- */ 

	abstract class Client  {
        public abstract string Send();
        public abstract string Receive(string text);
    }

    class ClientA:Client
    {
        public override string Send()
        {
            return "CA sends Data";
        }

        public override string Receive(string text)
        {
            return "CA received " + text;
        }


    }


    class ClientB:Client
    {

        public override string Send()
        {
            return "CB sends Data";
        }

        public override string Receive(string text)
        {
            return "CB received " + text;
        }
    }

/*  ----------------FÜR JAVA ----------------------------------------- */

    abstract class Client  {
        public abstract String Send();
        public abstract String Receive(String text);
    }

    class ClientA extends Client
    {
    	@Override
        public  String Send()
        {
            return "CA sends Data";
        }
    	
    	@Override
        public String Receive(String text)
        {
            return "CA received " + text;
        }


    }


    class ClientB extends Client
    {
    	@Override
        public String Send()
        {
            return "CB sends Data";
        }

    	@Override
        public String Receive(String text)
        {
            return "CB received " + text;
        }
    }