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: Will was moved up a grade because he was so smart. Sentence2: The teachers warned his dad that he wouldn't grow emotionally. Sentence3: His dad insisted on moving him up a grade. Sentence4: Will was hated throughout school. Sentence5: He is now a very confused and disliked adult.
Example Output: Will, Dad, School, Teachers

Example Input: Sentence1: My wife went to a party. Sentence2: They were selling cleaning supplies there. Sentence3: She liked it so much that she bought some. Sentence4: We tried it on the Windows and loved it. Sentence5: We then bought some more since we enjoyed it.
Example Output: I (myself), Wife

Example Input: Sentence1: Maya had gotten in trouble for sneaking out. Sentence2: Her mom insisted on drug testing her. Sentence3: Maya was angry and swore she didn't do drugs. Sentence4: She took the test and she passed it. Sentence5: She told her mom "I told you so" angrily.
Example Output:
Maya, Mom