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: My dog was bored. Sentence2: I was working all day so I couldn't spend time with him. Sentence3: When I finished work I decided to play with my dog. Sentence4: He was so happy to finally have some fun! Sentence5: Alas, he fell sick and died.
Example output: I (myself), Dog
Example explanation: There is only two characters in given story, i.e., I (myself) and dog.
Q: Sentence1: Kay was a waitress and good at crises. Sentence2: One night her boss said they were out of napkins. Sentence3: Kay wondered what to do. Sentence4: Then she had a great idea. Sentence5: She ripped up hand towels and passed them to the happy diners!
A:
Kay, Diners, Boss