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: Clayton was deathly afraid of house centipedes. Sentence2: One day he saw one scuttling around on his floor. Sentence3: Terrified, he called over his roommate to kill it for him. Sentence4: She walked in, unafraid, and swiftly smashed the bug with a book. Sentence5: Clayton was grateful and actually kind of impressed.
Example Output: Clayton, Roommate

Example Input: Sentence1: Samantha was going out for the night. Sentence2: She needed to withdraw money. Sentence3: She went to the atm and inserted her card. Sentence4: The atm displayed an error message! Sentence5: Sam drove to the grocery store and was able to get cash back instead.
Example Output: Samantha

Example Input: Sentence1: When Lana was pregnant, she was in a car accident. Sentence2: She was taken to the hospital for x-rays. Sentence3: Months later, the baby was born with a clubfoot. Sentence4: Lana sued the hospital for giving her x-rays while pregnant. Sentence5: She received a settlement, which she put aside for her son.
Example Output:
Baby, Lana

