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: Bob's bought a trailer that had a shingle roof. Sentence2: When it rained the roof would leak pretty badly. Sentence3: Bob checked his insurance policy to see if it was covered. Sentence4: The insurance replaced the shingle roof with a metal one. Sentence5: Bob's happy the rain doesn't leak into his house any more.

Output: Bob

Input: Consider Input: Sentence1: Don was four years old. Sentence2: He wanted to ride in a baby stroller. Sentence3: He could no longer fit in the stroller. Sentence4: This made him angry. Sentence5: He cried because he does not want to keep growing.

Output: Don

Input: Consider Input: Sentence1: Jeff had a great job working for a great company in Arkansas. Sentence2: He got an email from another company asking him to come work for them. Sentence3: They promised to double his salary if he came to work for them. Sentence4: He quit his job and relocated his family to Oklahoma for the new job. Sentence5: After 90 days at the new job, the company downsized and laid him off.
Output: Company, Jeff's family, Jeff