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: When I was little I used to chew my fingernails as a habit. Sentence2: My mom told me if I continued doing this it would make me really fat. Sentence3: Her plan worked, as my fear of getting huge stopped my nasty habit. Sentence4: Well, one day we saw our neighbor in the store, being quite pregnant. Sentence5: I pointed at her belly, saying I knew what she had been doing!

Ex Output:
I (myself), Neighbor, Mom

Ex Input:
Sentence1: Sam was making homemade fries for the first time. Sentence2: He had stepped out of the kitchen when he smelled smoke. Sentence3: He ran into the kitchen and saw an oil fire. Sentence4: He remembered to smother it instead of using water. Sentence5: Luckily, the fire was subdued and didn't make too much damage.

Ex Output:
Sam

Ex Input:
Sentence1: Mandy was driving too fast on an icy road. Sentence2: He skidded off the corner of a curve. Sentence3: Because of how fast he was going, he hit a tree very hard. Sentence4: Mandy was thrown through his windshield from the force. Sentence5: Mandy's seat belt still contained some of his body afterwards.

Ex Output:
Mandy