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: 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.
Example Output: Anthony, Jim

Example Input: Sentence1: I prepared for a job promotion many years ago. Sentence2: However I was passed over every time the position opened. Sentence3: I wanted to file a lawsuit but was scared I would lose. Sentence4: I filed the lawsuit anyway and some people made my life hard. Sentence5: I am glad I filed that lawsuit because I won life is good again.
Example Output: I (myself), Some people

Example Input: Sentence1: Nate loved playing outside. Sentence2: The frisbee was his favorite toy. Sentence3: He would throw it to his dog. Sentence4: The dog would bring it back. Sentence5: They spent hours playing this game.
Example Output:
Dog, Nate