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: Ken had just bought a new computer game. Sentence2: But he could not get it to work! Sentence3: So he called a smart friend over to help him install it. Sentence4: His friend got it figured out in no time. Sentence5: Soon the two boys were gaming together happily!

Output: Ken, Friend

Input: Consider Input: Sentence1: Robert and his wife took a trip to Bermuda. Sentence2: They were at the beach one day when Robert was stung by a jellyfish. Sentence3: There wasn't anyone around to call for help. Sentence4: Robert remembered what he heard on the radio about jellyfish stings. Sentence5: He scraped the sting with a credit card to help stop the stinging.

Output: Anyone, Robert, Wife

Input: Consider Input: Sentence1: Laura wanted to play the harp. Sentence2: She signed up for lessons in school. Sentence3: At first it was very difficult to learn. Sentence4: But soon she was playing wonderfully. Sentence5: She played so well, she got a solo in the school concert!
Output: Laura