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: Kathie fell from her bicycle. Sentence2: She bumped her head pretty hard on the ground. Sentence3: Kathie stood up dazed. Sentence4: A stranger escorted her to a hospital. Sentence5: Kathie was treated for a mild concussion.
Example Output: A stranger, Kathie

Example Input: Sentence1: Tammy is a lawyer. Sentence2: She enjoys helping people and earning money. Sentence3: A poor client asks her to take her case. Sentence4: She says no. Sentence5: Tammy felt bad for her and helped her anyway.
Example Output: Poor client, Tammy

Example Input: Sentence1: The man made a lewd joke. Sentence2: A woman called him childish. Sentence3: The man wanted to look more adult. Sentence4: He started speaking in a lower voice. Sentence5: It made the woman respect him.
Example Output:
A woman, The man