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: Leroy was a poor old man. Sentence2: He lived most of his life on the streets. Sentence3: He stumbled into a gas station. Sentence4: He wanted something to eat but found a lottery ticket. Sentence5: The ticket Leroy found was the winning ticket.
Example Output: Leroy

Example Input: Sentence1: Jon and his father were going hunting in the woods. Sentence2: They saw a deer through the bushes. Sentence3: Trying to keep quiet, they inched towards it. Sentence4: Jon stepped on a branch, and the deer was scared off. Sentence5: The deer would live another day.
Example Output: A deer, Jon, Father

Example Input: Sentence1: Tom loved break dancing. Sentence2: He was practicing at school. Sentence3: A rival dance team stepped up to him. Sentence4: They challenged him to a dance off. Sentence5: Tom obliged and they all had fun.
Example Output:
Rival dance team, Tom