package primer11;

import java.net.*;
import java.io.*;
import java.util.*;

public class Weblog {

	public static void main(String[] args) {

		Date start = new Date();
		try (BufferedReader bin = new BufferedReader(new InputStreamReader(new FileInputStream(args[0])));) {
			String entry = null;

			while ((entry = bin.readLine()) != null) {

				int index = entry.indexOf(' ');
				String ip = entry.substring(0, index);
				String theRest = entry.substring(index);

				try {
					InetAddress address = InetAddress.getByName(ip);
					System.out.println(address.getHostName() + theRest);
				} catch (UnknownHostException ex) {
					System.out.println(entry);
				}
			}
		} catch (IOException ex) {
			System.out.println("Exception: " + ex);
		}

		Date end = new Date();
		double elapsedTime = (end.getTime() - start.getTime()) / 1000.0;

		System.out.println("Elapsed time: " + elapsedTime + " seconds");

	}

}