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: On Thanksgiving morning the Smith girls were getting ready to cook. Sentence2: Everything was prepped and ready to cook, but something was missing. Sentence3: There was no cranberry sauce! Sentence4: The girls tried using other fruits to substitute, but none would do. Sentence5: Then Grandma Smith arrived with her world famous cranberry sauce!

Ex Output:
Grandma, Grandma smith, Smith girls

Ex Input:
Sentence1: Pete the clown was such a happy clown. Sentence2: He loved to bring smiles to the people of the rodeo. Sentence3: One day his boss calls him into his office. Sentence4: He tells pete he has to let him go. Sentence5: Pete was a very depressed and sad clown now.

Ex Output:
Pete, Boss, People

Ex Input:
Sentence1: The cat went down the stairs. Sentence2: The cat smelled something. Sentence3: The cat went to the kitchen. Sentence4: Her owner was cooking chicken. Sentence5: The cat liked chicken.

Ex Output:
Chicken, Her owner, The cat