Main {
(@
  static public void main(String args[]) throws Exception {
      A iA = A.parse(System.in);
      iA.f1(); 
      System.out.println();
      System.out.println("My traversal Done");
//      System.out.println("method f1 done " + r1);
//      int r2 = iA.f2(); 
//      System.out.println();
//      System.out.println("method f2 done " + r2);
}
@) 
  }
A {
  void f1() via C to D(TraceVisitor);
//  void f1() via =>X,C to D(DisplayVisitor);
//  int f2() bypassing B to C (Count_C_Visitor, DisplayVisitor);
}
/*
Count_C_Visitor {
  (@ int c; @)
  init (@ c=0; @)
  before C (@ c++; @)
  return int (@ c; @)
}*/