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.

Sentence1: Tom loved nuts. Sentence2: He was very frugal. Sentence3: He went shopping at the grocery store. Sentence4: He saw a huge discount on bulk walnuts for sale. Sentence5: He stocked up on walnuts.
Tom

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!
Bob, Helpful people, Lead moderator

Sentence1: Johnny saw the other kids jumping ramps with their bikes. Sentence2: He then attempted to make some jumps himself but crashed each time. Sentence3: Johnny was determined to jump ramps so he practiced every day. Sentence4: He started with small jumps and then graduated to the big ones. Sentence5: Johnny was able to out-jump the best bike jumpers.
Johnny