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.

Example Input: Sentence1: Jeb wanted to make the football team. Sentence2: He practiced every day. Sentence3: He ran as fast as he could. Sentence4: He could catch well. Sentence5: He made the team and was happy!
Example Output: Jeb

Example 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.
Example Output: Dean, Principal

Example Input: Sentence1: Eric didn't like typical birthday cakes. Sentence2: So he asked for a cheesecake for his birthday. Sentence3: He liked it so much, he ate 5 slices. Sentence4: But he felt completely terrible afterwards. Sentence5: Eric wished he got a typical birthday cake instead.
Example Output:
Eric