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: An asteroid blazed across the sky. Sentence2: It fell to the ground with a soft shock. Sentence3: A man walked by and looked at it. Sentence4: The rock glowed with heat as he reached for it. Sentence5: The man felt the heat and back off until it was cool.

Ex Output:
A man

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: I wanted to go on a cruise as I had never been on one before. Sentence2: For 2 years, I saved money every month from my paychecks. Sentence3: I went online to purchase a ticket for the cruise. Sentence4: The prices had increased dramatically compared to 2 years ago. Sentence5: I wasn't able to afford the trip, so I bought myself a tv instead.

Ex Output:
I (myself)