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: 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: Fred carefully unhitched the rented trailer. Sentence2: As he went to strap on the chain he noticed a missing link! Sentence3: He ducked under the trailer to find the rest of the chain. Sentence4: Fred hadn't properly set the brake and it rolled backwards. Sentence5: He slowly starved to death and was eaten by wild animals.

Ex Output:
Fred

Ex Input:
Sentence1: Howard liked to tell stories about make-believe things. Sentence2: One day he told a story to his mom about pixie's. Sentence3: His mother was very impressed and told him to write the story down. Sentence4: He did and showed it to his teacher the next day. Sentence5: Howard got an A+ on that writing assignment that week.

Ex Output:
Teacher, Mom, Howard