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: Dan entered an eating contest at his local fair. Sentence2: Dan was very competitive, and he could eat a whole pizza. Sentence3: When the contest started Dan stuffed hot dogs into his mouth. Sentence4: On his 30th hot dog it all came back up. Sentence5: Dan lost the contest, and was sick for days.
Dan