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.

Input: Consider Input: Sentence1: Tom moved out to the coast. Sentence2: He experienced his first earthquake. Sentence3: It was a minor one. Sentence4: Tom freaked out. Sentence5: His friends made fun of him.

Output: Friends, Tom

Input: Consider Input: 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.

Output: Simon, Joey

Input: Consider Input: Sentence1: Jill had set a goal for herself in the seventh grade. Sentence2: She maintained the highest grades ever since then. Sentence3: She was determined to be valedictorian. Sentence4: When she became a senior, she still had that goal. Sentence5: At graduation, she met her goal and presented her speech.
Output: Jill