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

public class MyVisitor extends Visitor {
    public void start() { System.out.println("start"); }
    public void finish() { System.out.println("finish"); }
    
    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(X o) { System.out.println("before X"); }
    public void after(X o)  { System.out.println("after X"); }
    
    public void before(Y o) { System.out.println("before Y"); }
    public void after(Y o)  { System.out.println("after Y"); }
}