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: Randy was out jogging one morning. Sentence2: Then suddenly, the world began to look different. Sentence3: He realized he had lost a contact lens. Sentence4: He went back to check and see if he could find it. Sentence5: Sadly, though, Randy's lens was gone for good.
Example Output: Randy

Example Input: Sentence1: Jane got pregnant. Sentence2: She did was using birth control. Sentence3: The doctor said the baby could come out wrong. Sentence4: Jane wasn't ready for all that. Sentence5: She decided to get an abortion.
Example Output: Jane, Baby, Doctor

Example Input: Sentence1: Russell was ahead of the curve. Sentence2: He excelled in school and passed all exams with ease. Sentence3: One day, an older man came to Russell's house. Sentence4: He spoke with his parents and then introduced himself to Russell. Sentence5: Russell was offered to go to a school for gifted and talented youth.
Example Output:
Older man, Parents, Russell