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.
Q: Sentence1: Chris was in a black market in Mongolia. Sentence2: He saw a sweater that looked very warm and fashionable. Sentence3: He tried to barter with the shopkeeper. Sentence4: The shopkeeper said 30 dollars and wouldn't go any lower. Sentence5: Chris realized he was not any good at bartering.
A:
Chris, Shopkeeper