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 visited a Facebook page accusing BLS of racism. Sentence2: BLS is short for Boston Latin School, a prestigious school. Sentence3: Several students wrote BLS fostered racism. Sentence4: I was a BLS graduate, and remembered racist incidents. Sentence5: I am preparing to add my comments to the page.

Ex Output:
I (myself), Students

Ex Input:
Sentence1: The monster truck driver eyed the ramp for his next stunt. Sentence2: He hit the gas and flew 30' in the air over a line of cars. Sentence3: The landing was rocky and so his truck went tumbling towards fans. Sentence4: Another driver blocked the fans but his truck to stop the other. Sentence5: The fans forgot the danger they were in and cheered like mad.

Ex Output:
Fans, Monster truck driver, Another driver

Ex Input:
Sentence1: Art occasionally saw passengers in other cars with head bandages. Sentence2: The bandages completely encircled the heads and looked weird. Sentence3: It reminded him of mummies that he had seen in the movies. Sentence4: When he turned 50 he had a face-lift. Sentence5: When he got home, he realized he looked just like those passengers.

Ex Output:
Passengers, Art