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: Dave was a scientist. Sentence2: Dave wanted to make a great scientific discovery. Sentence3: Dave worked with algae to make electricity. Sentence4: Dave discovered he could make electricity with algae! Sentence5: Dave was awarded for his great discovery.

Ex Output:
Dave

Ex Input:
Sentence1: Bob started working on Mturk to get some money. Sentence2: He needed a good place to find helpful people and good HITs. Sentence3: Bob came across a forum called the MTG. Sentence4: He talked on this forum and was very happy to be involved. Sentence5: Bob eventually game a lead moderator of the MTG!

Ex Output:
Bob, Helpful people, Lead moderator

Ex Input:
Sentence1: Grandma Jenkins cooked a large pot of gumbo for lunch. Sentence2: She called the entire family to come over and eat. Sentence3: Everyone ate some gumbo then went back for more! Sentence4: After lunch, everyone helped clean the dishes. Sentence5: Grandma Jenkins delighted in her time spent with family.

Ex Output:
Grandma jenkins, Family