/* Listing4601.java */

import java.net.*;

public class Listing4601
{
  public static void main(String[] args)
  {
    if (args.length != 1) {
      System.err.println("Usage: java Listing4601 <host>");
      System.exit(1);
    }
    try {
      //Get requested address
      InetAddress addr = InetAddress.getByName(args[0]);
      System.out.println(addr.getHostName());
      System.out.println(addr.getHostAddress());
    } catch (UnknownHostException e) {
      System.err.println(e.toString());
      System.exit(1);
    }
  }
}