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: Simon invited his friend Joey over for a play-date. Sentence2: He was looking forward to playing Minecraft with his friend. Sentence3: Right before Joey arrived, the internet went out. Sentence4: Simon tried resetting the router, but it didn't help. Sentence5: Simon and Joey played outside until the router was back online.
[A]: Simon, Joey

[Q]: Sentence1: Don was four years old. Sentence2: He wanted to ride in a baby stroller. Sentence3: He could no longer fit in the stroller. Sentence4: This made him angry. Sentence5: He cried because he does not want to keep growing.
[A]: Don

[Q]: Sentence1: Harry was presenting his research at a symposium. Sentence2: Researchers in the field kept asking him a myriad of questions. Sentence3: It was very mentally taxing. Sentence4: Apparently his PI had told his friends about Harry's work. Sentence5: That's why he was getting questioned all day.
[A]:
Friends, Researchers, Harry