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: The knot was beginning to swell painfully. Sentence2: She put a frozen bag of peas on it. Sentence3: It was very cold. Sentence4: She started to cry from the pain. Sentence5: She decided to go to the doctor.
A:
Doctor