Given the task definition and input, reply with output. In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Sentence1: Billy needed to make some money. Sentence2: He decided on Friday night he would work from home. Sentence3: Turning his computer on he realized there was a lot of work up! Sentence4: It didn't take him long to get into the swing of things. Sentence5: Before he knew it, he was working his butt off and making money.
Billy