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: Gina had inherited a house from her parents. Sentence2: She wanted to sell the house. Sentence3: Gina took out the things that had sentimental value. Sentence4: She found a realtor to sell the house. Sentence5: Gina sold the house to a buyer.
Example Output: Realtor, Buyer, Gina, Parents

Example Input: Sentence1: Last year Paul was about an inch too short for the big roller coaster. Sentence2: He was confident when he walked up to the measuring stick. Sentence3: Sure enough, he had grown well over an inch. Sentence4: He proudly got on the roller coaster. Sentence5: It was as much fun as he expected it to be!
Example Output: Paul

Example Input: Sentence1: Bob got detention. Sentence2: He was bored. Sentence3: He decided to draw on his desk. Sentence4: The teacher caught him. Sentence5: He was sentenced two more days of detention.
Example Output:
Bob