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: Jerry asked if his friend can pay him for climbing the monkey bars. Sentence2: They agreed to hand him $10 dollars each. Sentence3: He grabbed the first bar and climbed across. Sentence4: His hand ended up slipping on one of the bars. Sentence5: He landed on the ground, with his stomach falling first.
Example Output: Jerry, Friend

Example Input: Sentence1: Terry was going through a big issue. Sentence2: He started questioning everything around him. Sentence3: He started believing that he is the only one who exists. Sentence4: No matter how his friends and family tried to convince him he wasn't. Sentence5: He never would budge.
Example Output: Friends, Family, Terry

Example Input: Sentence1: I went to the vets office with my dog Princess. Sentence2: The receptionist had a four month old Boston Terrier on her lap. Sentence3: She told me she was trying to find a home for him. Sentence4: Since Princess was the same breed and age, I could not resist. Sentence5: I left the vets office, with a brother for Princess.
Example Output:
I (myself), Princess, Receptionist, Boston terrier, Dog