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: Debra was looking for her cat. Sentence2: Sam said she'd help her. Sentence3: The cat was on a tree. Sentence4: Sam climbed up the tree but fell. Sentence5: The cat jumped down the tree.

Output: Her cat, Sam, Debra

Input: Consider Input: Sentence1: Aurelia has been trying to find a hobby for months. Sentence2: Finally a friend recommends that Aurelia try knitting. Sentence3: Aurelia begins by knitting a green sweater. Sentence4: She finds knitting a relaxing way to forget her problems. Sentence5: Aurelia is very happy that she found a good hobby.

Output: Friend, Aurelia

Input: Consider Input: Sentence1: Katie really wanted to be a cheerleader. Sentence2: She decided to go to the tryouts. Sentence3: When she got to the tryouts she did her routine. Sentence4: She did a backflip and some cheers. Sentence5: The captain agreed to let her on the team.
Output: The captain, Katie