import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class Main {
    public static void main(String[] args) throws IOException {
        int server_port = 5679;
        Socket socket = new Socket("localhost", server_port);
        InputStream input = socket.getInputStream();
        OutputStream output = socket.getOutputStream();
        byte[] buf = new byte[3];

        buf[0] = 10;
        buf[1] = 20;
        buf[2] = 30;

        output.write(buf);
        int got = input.read(buf);
        for (int i = 0; i < got; i++)
            System.out.printf(" %d", buf[i]);
        System.out.print("\n");

        socket.close();
    }
}