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: 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: Ken was a cook. Sentence2: Ken was given an order for a medium rare steak. Sentence3: Ken cooked up the steak nice and rare. Sentence4: He went to serve it to the customers. Sentence5: The customer told him they wanted it well done.

Ex Output:
Customer, Ken, Customers

Ex Input:
Sentence1: Donald had always wanted to meet the president. Sentence2: It was recently announced that the president was visiting his town. Sentence3: Donald waited in line for three days to meet the president. Sentence4: After Donald met the president, he went home to rest. Sentence5: Donald was able to have a good night's rest after meeting the president.

Ex Output:
The president, Donald