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: Anna was fourteen and only five feet tall. Sentence2: She feared she had reached her adult height. Sentence3: But at her next doctor's appointment, she got good news. Sentence4: She had grown almost a full inch taller! Sentence5: The doctor said Anna could grow until she was 18 - or even older!
A:
Anna, Doctor