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 Input: Sentence1: Alexa loves photography. Sentence2: She went to college for photography. Sentence3: She spent all her free time taking photos. Sentence4: Alexa's parents decided to buy her a camera as a graduation gift. Sentence5: Alexa loves her new camera and takes pictures with it daily.
Example Output: Alexa's parents, Alexa

Example Input: Sentence1: This morning I started my day full energy. Sentence2: I cleaned the glass coffee and lamp tables. Sentence3: I scrubbed the bathroom like it belonged in a five star hotel. Sentence4: I cooked Tuna Croquettes, Fennel rice and made a strawberry salad. Sentence5: Now it's evening and I am tired with no more energy.
Example Output: I (myself)

Example Input: Sentence1: A man was walking down the street. Sentence2: The cop thought he looked suspicious. Sentence3: The cop started questioning the man. Sentence4: The man was frightened. Sentence5: The cop then attacked him for no reason.
Example Output:
Cop, Man