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.

Example Input: Sentence1: The boy asked for permission. Sentence2: Permission was denied. Sentence3: The boy did it anyways. Sentence4: He got caught. Sentence5: The boy was punished.
Example Output: Boy

Example Input: Sentence1: I needed to get groceries yesterday. Sentence2: I walked to the store instead of driving. Sentence3: On the way, I thought about what I needed to buy. Sentence4: I took my list into the store with me. Sentence5: I bought everything on the list, and had trouble carrying it home.
Example Output: I (myself)

Example Input: Sentence1: I was at the bank the other day. Sentence2: The girl working the counter was really cute. Sentence3: I started to flirt. Sentence4: She lost interest when she saw my bank account. Sentence5: I don't want a gold digger anyway.
Example Output:
I (myself), The girl, Bank