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: Bill decided to enter a woodworking contest at his school. Sentence2: He decided he would sculpt up a piece of wood to look like his school. Sentence3: It took him 6 long months but he finally finished it. Sentence4: He ended up blowing the competition out of the water. Sentence5: He won first place and received a tuition as a reward.
Bill