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: 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 solution: I (myself), Dog
Example explanation: There is only two characters in given story, i.e., I (myself) and dog.

Problem: Sentence1: Ken's new neighbors were very attractive. Sentence2: Unfortunately they always wore heels and lived upstairs. Sentence3: One night they were stomping around extra loud. Sentence4: Ken wanted to go up and ask them to be quiet. Sentence5: Unfortunately he was too shy to do so.
Solution: Neighbors, Ken