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: Jen is trying to quit smoking. Sentence2: She spends too much money on smoking and it's bad for her. Sentence3: She asks around for the best way to stop. Sentence4: She decides to try this gum to assist her in quitting. Sentence5: Within a month she is down to just one cigarette a day!
Jen