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 have been working on my computer all day today. Sentence2: I have been working very hard. Sentence3: Around noon, my computer shut off. Sentence4: This was very unexpected and it made me mad. Sentence5: I figured out what was wrong with it and I got back to work.
I (myself)