Main {
  public static void main(String args[]) throws Exception {{
    A a = A.parse(System.in);
    System.out.println();
    a.print();
    System.out.println(" A printed");
    System.out.println();
    ClassGraph cg = new ClassGraph(true, false);
    TraversalGraph tg = new TraversalGraph("from A to B",cg);
    a.getB(tg);
  }}
}

A {
{{
   void getB(TraversalGraph tg){
     tg.traverse(this, new Visitor(){
       void before(B b) { b.print(); System.out.println(" B printed");}
       // void before(C c) { c.print(); System.out.println(" C printed");}
     });
   }
}}
}