Given the task definition and input, reply with output. 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.

Sentence1: Abby always wanted to be a doctor. Sentence2: Abby dreamed of the day she would be known as Dr Abby. Sentence3: However, Abby just could not grasp the medical information required. Sentence4: Abby knew she had to find another career field. Sentence5: Abby was disappointed that her doctor dreams did not come true.
Abby