///////    DisplayType.java    ///////
import java.io.*;

public class DisplayType
{  public static void displayType(Class cbj, int level, boolean cl)
   {   if ( cbj == null || cbj == root ) return;
       if ( level == 0 )
          out.println((cbj.isInterface() ? "interface " : "class ")
                          + cbj.getName() );
       else
       {  for (int i =0 ; i < level ; i++) out.print("   ");
          out.println( (cbj.isInterface()&&cl ? 
              "implements " : "extends ") + cbj.getName() );
       }
       if ( cbj.isArray() ) return;
       Class[] faces = cbj.getInterfaces();
       if ( faces != null )
          for (int i =0 ; i < faces.length ; i++)
             displayType(faces[i], level+1, !cbj.isInterface());
       displayType(cbj.getSuperclass(), level+1, !cbj.isInterface());
   }

   public static void main(String[] args)
   {   try
       {   out = new PrintWriter(System.out);
           root = Class.forName("java.lang.Object");
           for (int i =0 ; i < args.length ; i++)
               displayType(Class.forName(args[i]),0,false);
           out.close();
       } catch (ClassNotFoundException e)
         {   System.err.println(e.getMessage());  }
   }
       
   private static PrintWriter out;
   private static Class root;
}