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.

Input: Consider 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.

Output: I (myself), Princess, Receptionist, Boston terrier, Dog

Input: Consider Input: Sentence1: Tina had sampled her mom's wine last night. Sentence2: Her mom had caught her and grounded her. Sentence3: But the next morning, Tina woke with a terrible hangover. Sentence4: She thought that was a far worse punishment than the grounding. Sentence5: Tina vowed never to drink alcohol again!

Output: Tina, Her mom

Input: Consider Input: Sentence1: May owned a house and rented a room to a student name Charles. Sentence2: Every year, in December, May took a flight to Japan. Sentence3: This year, on her flight, her flight attendant looked familiar to her. Sentence4: May asked the flight attendant did they know each other? Sentence5: The flight attendant was Charles' mother!
Output: May, Charles, Flight attendant, Charles' mother