[Haskell-beginners] Re: Tutorial/Book with Exercises

Michael Mossey wrote:

YAHT has some hard exercises, early on. He introduces continuations in chapter 4, briefly, and then casually asks you to rewrite map and filter in continuation-passing-style. I was stumped.

So am I. Do you have any hints for these, without giving the answers away (I know the answers are in the appendix if I really need them)?