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: Joe was bit by a cat when he was very young. Sentence2: Since then, he has always been scared of cats. Sentence3: One day at school, a cat came up to him and played with him. Sentence4: Joe had a lot of fun with the cat. Sentence5: Now, Joe is not scared of cats.

Ex Output:
Joe, Cat

Ex Input:
Sentence1: John was at home thinking about what to eat for dinner. Sentence2: He went to the fridge and looked inside. Sentence3: He saw that he had some fish. Sentence4: John cooked the fish in a frying pan. Sentence5: He ate the fish for dinner.

Ex Output:
John

Ex Input:
Sentence1: James was an aspiring guitarist. Sentence2: He practiced his guitar everyday after class. Sentence3: He would play his guitar in his garage for hours. Sentence4: One day his neighbors complained about the loud sound to the police. Sentence5: The police arrived and told James to turn the volume down.

Ex Output:
Neighbors, James, Police