Instructions: 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: Sentence1: It was time for the Cook's to go own their annual summer vacation. Sentence2: All of the hotel reservations had been made. Sentence3: They rented a van to drive to Florida. Sentence4: On the drive there they learned a hurricane was eminent. Sentence5: They decided to tour Nashville.
Output:
Cook