Definition: 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: Joel owned a restaurant. Sentence2: He hired a cook that didn't care about his work. Sentence3: The cook didn't clean after himself. Sentence4: The kitchen was a mess. Sentence5: Joel's restaurant got closed by the board of health.
Output:
Board of health, A cook, Joel