import java.io.InputStream;
import static java.lang.System.out;
import java.net.InetSocketAddress;
import java.net.Socket;

/**
 *
 * @author Naik
 */
public class Server {

    public static void main(String... params) {
        checkServer();
    }

    public static void checkServer() {
        int timeout = 300;
        int port = 21;
        InetSocketAddress addr = new InetSocketAddress("193.189.127.107", port);
        Socket sock = new Socket();
        try {
            sock.connect(addr, timeout);
            //out.println(readFromSocket(sock));
            //out.println("OK");
            out.println(readSocket(sock));
            out.println("OK");
            sock.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }

    private static String readFromSocket(Socket sock) throws Exception {
        InputStream in = sock.getInputStream();
        StringBuilder result = new StringBuilder(" ");
        int timeout = 0;
        int a;
        while (true) {
            a = in.available();
            if (a > 0) {
                int r = in.read();
                if (r == -1) {
                    break;
                }
                result.append((char) r);
                timeout = 0;
            } else {
                Thread.sleep(10);
                a = in.available();
                if (a == 0) {
                    timeout++;
                }
                if (timeout > 40) {
                    break;  // timeout
                }
            }
        }
        return result.toString();
    }

    private static String readSocket(Socket sock) throws Exception {
        InputStream in = sock.getInputStream();
        StringBuilder result = new StringBuilder(" ");
        int r;
        while ((r = in.read()) != -1) {
            result.append((char) r);
        }
        return result.toString();
    }
}