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: Spencer had a project due. Sentence2: He had not done it yet. Sentence3: He got all the stuff together for it. Sentence4: He did it quickly. Sentence5: He turned it in on time.

Ex Output:
Spencer

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: Sam wanted to learn how to read. Sentence2: He thought his friends would mock his illiteracy. Sentence3: But when they found out, they were all very kind. Sentence4: They even volunteered to teach him his letters. Sentence5: After months of studying, Sam became a great reader!

Ex Output:
His friends, Sam