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.
Q: Sentence1: I used to work on Mechanical Turk Sentence2: I hated captcha codes. Sentence3: I could never seem to type them correctly. Sentence4: One time, I missed ten captcha codes in a row! Sentence5: Amazon decided to ban me.
A:
I (myself)