Given the task definition and input, reply with output. 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.

Sentence1: Kat wanted to go to the prom. Sentence2: She didn't have enough money for a prom dress. Sentence3: Her parents didn't have enough money to buy the dress for her either. Sentence4: One of Kat's friends had an old dress that fit her. Sentence5: Kat borrowed the dress to go to the prom.
Her parents, One of kat's friends, Friend, Kat