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: Jim was sledding with his friend Anthony. Sentence2: Anthony dared him to go down the big hill. Sentence3: Jim took up the dare and as he was going he fell out of the sled. Sentence4: Jim rolled a few times as the unmanned sled flew into the river. Sentence5: Jim was ok, and the two of them went home for the day.

Ex Output:
Anthony, Jim

Ex Input:
Sentence1: Natasha cared a lot about her grades. Sentence2: In order to get an A in gym class, she would need to climb the rope. Sentence3: Natasha was nervous, as she wasn't very strong. Sentence4: She decided to start lifting weights. Sentence5: On the day of the test, Natasha climbed to the top!

Ex Output:
Natasha

Ex Input:
Sentence1: My mom's boyfriend got me a present for Christmas. Sentence2: Usually he doesn't, so I was excited to open it. Sentence3: It's a bottle of Proactiv solution. Sentence4: He smiles really big and asks me if I like it. Sentence5: He says he wants to start including me in family pictures.

Ex Output:
I (myself), Mom's boyfriend