Instructions: 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.
Input: Sentence1: Ray was shopping at a store. Sentence2: The workers at the store were rude to Ray. Sentence3: Ray had a credit card for the store. Sentence4: He paid off the credit card immediately. Sentence5: Ray cut up the card so he would never shop there again.
Output:
Workers, Ray