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

public class RssChecker
{

    public static String findRss(String url) throws Exception
    {
        URL u = new URL(url);
        BufferedReader bis = new BufferedReader(
                             new InputStreamReader(u.openStream()));
        
        String line;
        String rssUrl = null;
        
        while ( ( line = bis.readLine()) != null)
        {
            if (line.indexOf("title=\"RSS\"") > -1)
            {
                String substr = line.substring(line.indexOf("href=\"") + 6,
                                               line.length());
                rssUrl = substr.substring(0, substr.indexOf("\""));
                break;
            }
        }
        return rssUrl;
    }
    
    public static void main(String[] args) throws Exception
    {
        String url = args[0];
        
        String rssUrl = RssChecker.findRss(url);
        
        System.out.println("rssUrl -> " + rssUrl);
    }
}