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: Callie was a gymnast and practiced every day. Sentence2: One day, she landed badly and her leg was in excruciating pain. Sentence3: She was determined and decided to just keep going. Sentence4: The next day, she collapsed at the gym because the pain was so bad. Sentence5: At the hospital, she learned waiting had made her injury much worse.
A:
Callie