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: Consider Input: Sentence1: Sam had a big exam for an important college course. Sentence2: He studied hard and went to every class. Sentence3: On the day of the exam he noticed the room was empty. Sentence4: The time and location had been changed. Sentence5: He never bothered to check his email and didn't know.

Output: Sam

Input: Consider Input: Sentence1: A woman was walking. Sentence2: She sat on a bench. Sentence3: There was a man next to her. Sentence4: She realized it was her ex husband. Sentence5: This must have been accidental.

Output: Ex husband, A woman, A man

Input: Consider Input: Sentence1: The woman stole a bike from the store. Sentence2: The store caught it on a camera. Sentence3: They called the cops. Sentence4: The cops found the woman. Sentence5: The woman went to jail.
Output: The woman, The cops, The store