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: Warren didn't like beets and told his mom repeatedly. Sentence2: But as she never listened, he had some on his plate for dinner. Sentence3: He tried to give them to his dog. Sentence4: The dog sniffed them and walked away. Sentence5: Warren refused to eat the beets as his dog didn't want them either.

Ex Output:
Dog, Mom, Warren

Ex Input:
Sentence1: Nora went to the dentist this week. Sentence2: She was nervous they would find cavities because she had a toothache. Sentence3: Her fears were confirmed when they found two. Sentence4: The dentist told her she'd have to schedule follow up visits. Sentence5: She's getting fillings next Wednesday.

Ex Output:
Nora, The dentist

Ex Input:
Sentence1: Patti was the prettiest girl in school. Sentence2: She was also mean, and teased the new girl, June, over her acne. Sentence3: June was kind and tried to be friendly, but Patti kept teasing her. Sentence4: One day, Patti had a car accident and got a big scar across her face. Sentence5: Everybody shunned her except June, whose skin was now clearing.

Ex Output:
Everybody, June, Patti