import EDU.neu.ccs.demeter.dj.Visitor;

public class MyVisitor extends Visitor {
  public void start() { System.out.println("begin"); }
  public void finish() { System.out.println("end"); }

  public void before(A o) { System.out.println("before A"); }
  public void after(A o)  { System.out.println("after A"); }

  public void before(B o) { System.out.println("before B"); }
  public void after(B o)  { System.out.println("after B"); }

  public void before(C o) { System.out.println("before C"); }
  public void after(C o)  { System.out.println("after C"); }

  public void before(S o) { System.out.println("before S"); }
  public void after(S o)  { System.out.println("after S"); }

  public void before(X o) { System.out.println("before X"); }
  public void after(X o)  { System.out.println("after X"); }
}