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: I had a glass of water. Sentence2: I thought it tasted bland. Sentence3: I opened my refrigerator. Sentence4: I found a lemon in the door. Sentence5: I squeezed lemon into my water.

Ex Output:
I (myself)

Ex Input:
Sentence1: Dean decided he was going to prank his principle. Sentence2: He took a carton of eggs from his fridge and headed out. Sentence3: He arrived at his principal's house a little after midnight. Sentence4: After throwing two eggs his principle came outside. Sentence5: He was forced to clean up the mess and serve detention for a month.

Ex Output:
Dean, Principal

Ex Input:
Sentence1: Debra won the poker tournament today. Sentence2: She began at 12 and played until 9. Sentence3: It was a long day that had a total of 35 players. Sentence4: Debra worked hard and paid attention to her opponents. Sentence5: She came in first place and one $1,200.

Ex Output:
35 players, Her opponents, Debra