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: Sue had to make brownies for her party. Sentence2: Halfway through baking she realized that she had no eggs. Sentence3: Sue walked to her neighbor's to borrow two. Sentence4: The neighbor greeted her at the door. Sentence5: He gave her two eggs and told her to not worry about repayment.

Ex Output:
Sue, Neighbor

Ex Input:
Sentence1: Joe hungered for power. Sentence2: He did anything and stepped on everyone to get to the top. Sentence3: As he was good at his job, it worked. Sentence4: He became very famous and had a lot of money. Sentence5: Now that he has power, Joe doesn't know what to do with his time.

Ex Output:
Everyone, Joe

Ex Input:
Sentence1: I needed to solve a system of equations. Sentence2: I was using traditional algebra. Sentence3: My friend saw this and said I should use Gaussian reduction. Sentence4: I researched Gaussian reduction and learned the method. Sentence5: It worked great for solving a system of equations.

Ex Output:
I (myself), My friend