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 was taking a long business trip one evening. Sentence2: I got terribly lost and my cell phone had died. Sentence3: It was dark and began to rain and I felt myself getting very anxious. Sentence4: I pulled into a gas station and asked for directions. Sentence5: In an hour I arrived safely at the hotel and fell asleep!

Ex Output:
I (myself)

Ex Input:
Sentence1: Dirt Nasty was a rapper. Sentence2: He spun rhymes about his escapades. Sentence3: He was so good at it, they forgot there was a person behind the name. Sentence4: Thus Dirt fell into a depression. Sentence5: In his depression, he gave up rap, and took up advocacy work.

Ex Output:
Dirt nasty

Ex Input:
Sentence1: Sara and Joseph were planning their wedding. Sentence2: They were on a tight budget. Sentence3: They couldn't afford a three tiered cake. Sentence4: Sara ordered a one tier cake and baked matching cupcakes. Sentence5: The cupcakes were a big hit amongst the guest.

Ex Output:
Joseph, Sara, Guest