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: My girlfriend and I decided to cook together Tuesday. Sentence2: We chose to make fajitas. Sentence3: It was fun and easy. Sentence4: We only got in each other's way a little. Sentence5: The food was delicious and we plan to do it again soon.
Example Output: Girlfriend, I (myself)

Example Input: Sentence1: Sean was going out to pick up the mail. Sentence2: His wife asked if he could pick up some formula. Sentence3: At first, he said no, because it was out of his way. Sentence4: Later, he arrived home. Sentence5: In his hands, he had the formula for his wife, surprising her.
Example Output:
Sean's wife, Sean