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.

Input: Consider 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.

Output: I (myself), Students

Input: Consider Input: Sentence1: I made spaghetti last night. Sentence2: I went to the fridge to get my Romano cheese, which I love! Sentence3: To my great disappointment, I had none. Sentence4: I thought grated cheddar might be a replacement. Sentence5: I tried that and it was horrible, so I ate a hamburger instead.

Output: I (myself)

Input: Consider Input: Sentence1: Roy inherited a grand piano. Sentence2: He moved it into his living room. Sentence3: Then he decided to teach himself to play it. Sentence4: He studied the music daily. Sentence5: Soon he was a very talented pianist!
Output: Roy