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.

Example Input: Sentence1: I used to deliver fliers everyday in the hot sun. Sentence2: My water bottle always ended up really hot. Sentence3: When I put ice in it, the ice melted. Sentence4: I decided to buy a special thermos that kept the cold in. Sentence5: Now I always had cold water when I was in the hot sun.
Example Output: I (myself)

Example Input: Sentence1: Terry was going through a big issue. Sentence2: He started questioning everything around him. Sentence3: He started believing that he is the only one who exists. Sentence4: No matter how his friends and family tried to convince him he wasn't. Sentence5: He never would budge.
Example Output: Friends, Family, Terry

Example Input: Sentence1: Brent is an avid hunter. Sentence2: Brent wanted to shoot a deer. Sentence3: Brent put on his camouflage gear. Sentence4: Brent was not able to hunt a deer. Sentence5: Brent went home disappointed.
Example Output:
Brent