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: 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

Example Input: Sentence1: Jim designed a fun game website in his spare time. Sentence2: He shared it with some friends, and it became popular. Sentence3: One morning Jim woke to a message in his inbox. Sentence4: A major company wanted to buy Jim's site for $15 million! Sentence5: Jim was overjoyed!
Example Output: Company, Jim, Friends

Example Input: Sentence1: Allen had never seen a play performed live before. Sentence2: He was reluctant to go when his girlfriend asked him to a performance. Sentence3: He thought the tickets were too expensive and it would be boring. Sentence4: But when they saw the play, Allen was surprised how much he liked it. Sentence5: It was too expensive to do often, but he planned to go sometimes.
Example Output:
His girlfriend, Allen