public class NewClass {
    public static void main(String[] args) {
        System.out.println(extratit("puket.psu.ac.th/*aaa.html"));
    }
    static String extratit(String url)
    {
        String f = null;
        String[]t=url.split("/");
      // System.out.print(t[t.length-1]);
       if(t[t.length-1].startsWith("*"))
       {
           f="_"+t[t.length-1].substring(1);

            return f;
       }
       else{
           return t[t.length-1];
       }

    }
}