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: Ken was a cook. Sentence2: Ken was given an order for a medium rare steak. Sentence3: Ken cooked up the steak nice and rare. Sentence4: He went to serve it to the customers. Sentence5: The customer told him they wanted it well done.

Ex Output:
Customer, Ken, Customers

Ex Input:
Sentence1: Evan is a Sailor in the Navy. Sentence2: He is on a ship that travels around the world. Sentence3: He went to visit Spain and came home with sea shells from the beach. Sentence4: He gave those sea shells to a pretty girl named April. Sentence5: She liked them so much they decided to get married.

Ex Output:
Is

Ex Input:
Sentence1: I found a puppy for my daughter online. Sentence2: I decided to drive to pick up the puppy. Sentence3: On the way I got a flat tire and it started to rain. Sentence4: I called the seller of the puppy and she brought me the puppy. Sentence5: I changed my tire and brought the puppy home.

Ex Output:
I (myself), The seller, Puppy, Daughter