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: Tom wanted to secure his future. Sentence2: He decided to learn how to program. Sentence3: He google searched for days to determine the best language. Sentence4: He decided that Ruby was the best programming language for him. Sentence5: He bought books on Ruby and worked hard, he learned Ruby well.

Ex Output:
Tom

Ex Input:
Sentence1: My mother and I were hit by lightning. Sentence2: We both had just gotten into the car. Sentence3: The entire car shook for a few seconds and all the window lit up. Sentence4: We both couldn't believe it and looked at each other. Sentence5: Then we drove away.

Ex Output:
I (myself), My mother

Ex Input:
Sentence1: Belle was at a party. Sentence2: And someone ordered pizza and tacos. Sentence3: Belle ate three slices of pizza and a large taco. Sentence4: And she decided to get more food. Sentence5: But as she approached the kitchen, people began to stare at her.

Ex Output:
Belle, Someone, People