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 playing music on my CD player. Sentence2: I dropped the CD player. Sentence3: It didn't play music anymore. Sentence4: Then I found twenty dollars on the ground. Sentence5: I was able to buy a new CD player.

Ex Output:
I (myself)

Ex Input:
Sentence1: Waiting for the next train to pull up, Harry was nervous. Sentence2: He was only a few hours away from his big interview. Sentence3: Spending the last three months sending out resumes, this was it. Sentence4: Boarding the train, he noticed something strange about the inside. Sentence5: He had hopped on the wrong color train, and would be late.

Ex Output:
Harry

Ex Input:
Sentence1: I moved to a new city two weeks ago. Sentence2: Now I'm going to get a local library card. Sentence3: I go to the nearest city branch of the public library system. Sentence4: I ask them if I can get a card. Sentence5: They tell me I can not, as I have no proof of residence with me.

Ex Output:
I (myself)