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: I'm working in the yard today. Sentence2: I am picking up all the random sticks. Sentence3: I'm going to build a fire. Sentence4: That way, I can cook these hot dogs. Sentence5: I don't want them to go bad.
I (myself)