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: Jacob noticed his dog was whining. Sentence2: Jacob investigated and found his dog's leg hurt. Sentence3: He took the dog to see the vet. Sentence4: The vet made a cast to set the hurt leg. Sentence5: Within a few weeks, Jacob and his dog were playing again!

Output: Jacob, Vet, Dog

Input: Consider Input: Sentence1: Jan wanted a new purse. Sentence2: She knew should could not afford the one she wanted. Sentence3: She decided to start saving until she could. Sentence4: Jan finally had enough money. Sentence5: When she went to buy the purse, it was gone.

Output: Jan

Input: Consider Input: Sentence1: Abby met the time traveler at a restaurant. Sentence2: She met him again in apartment, wearing considerably less. Sentence3: Abby couldn't get the scientist out of her head. Sentence4: Weeks went by, and the affair went down in her notes again and again. Sentence5: Abby couldn't decide how to end the sci fi story she was writing.
Output: Traveler, Abby