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.

Ex Input:
Sentence1: Rina had never been to the dentist as a child. Sentence2: Now she was 25 and her teeth hurt her constantly. Sentence3: Finally she scraped up some money and courage and went to a dentist. Sentence4: To her surprise, he was kind and very helpful! Sentence5: He worked out a payment plan to fix Rina's teeth!

Ex Output:
Dentist, Rina

Ex Input:
Sentence1: My husband and I decided we wanted to grow our own fresh vegetables. Sentence2: We tilled and prepared the area we decided would work best. Sentence3: After the tilling was done, we laid weed barrier down over the ground. Sentence4: We staked some fencing around the garden plot to keep animals out. Sentence5: After all that was done, we planted our vegetables in rows.

Ex Output:
I (myself), Husband

Ex Input:
Sentence1: Nia broke her leg. Sentence2: She had to get a cast put on it. Sentence3: She was awkward at first wearing it. Sentence4: But soon she grew used to it. Sentence5: Before long, she could walk with ease!

Ex Output:
Nia