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.

Ex Input:
Sentence1: Dean decided he was going to prank his principle. Sentence2: He took a carton of eggs from his fridge and headed out. Sentence3: He arrived at his principal's house a little after midnight. Sentence4: After throwing two eggs his principle came outside. Sentence5: He was forced to clean up the mess and serve detention for a month.

Ex Output:
Dean, Principal

Ex Input:
Sentence1: The announcer called out Fran's name. Sentence2: She walked her lamb, Edna, into the small arena. Sentence3: Edna's white coat looked like a giant cotton ball. Sentence4: Fran stopped walking allowing the judges to look over Edna. Sentence5: After the judges handed in their scorecards, Fran exited the arena.

Ex Output:
Announcer, Fran, Edna, Judges

Ex Input:
Sentence1: My friend Joe has a son, 16. Sentence2: When his son was 13 he told his dad there was no summer reading. Sentence3: Joe believed his son. Sentence4: I went online and found the school did have summer reading. Sentence5: Joe told his son to do the reading, plus one book.

Ex Output:
I (myself), Son, Joe