ABC accepts all genres of fiction, including science fiction and fantasy, romance, crime and chick-lit. They also accept your old graphic novels. The only thing they don't accept is non-fiction and children's books. ABC prefers mass-market paperbacks (pocket books) but will also accept large paperbacks and hardcovers.
In return you will receive ABC Certificates, with which you can pay in all ABC stores. They are valid indefinitely. Please note that ABC does not pay in cash. ABC decides how much you get for your books and they have the right to refuse books they can not sell.