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: James had two best friends who hated each other. Sentence2: He could never see them together but always apart. Sentence3: For his birthday, he made an exemption and invited them both. Sentence4: It was a gamble, but it worked. Sentence5: The two friends went over their disagreement for the sake of James.

Ex Output:
James, Best friends

Ex Input:
Sentence1: I was feeling a little hungry. Sentence2: I decided to make oysters. Sentence3: But first, I had to find some. Sentence4: I went to the beach and began looking. Sentence5: By the end of the day, I had caught twenty oysters!

Ex Output:
I (myself)

Ex Input:
Sentence1: The man signed up for a new cell phone plan. Sentence2: He got a new phone with the plan. Sentence3: He was not happy with the service. Sentence4: He cancelled the service early. Sentence5: He had to pay the full retail price of the phone as a penalty.

Ex Output:
The man