Detailed 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.
Q: Sentence1: Stephen woke up with a jolt. Sentence2: His cat, Sprinkles, had just jumped on his stomach. Sentence3: Sprinkled meowed impatiently. Sentence4: Stephen grumbled in response and got out of bed. Sentence5: He went to the kitchen and retrieved the cat food.
A:
Stephen, Sprinkles