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: Tina felt sick one morning before getting ready for school. Sentence2: She decided to go to the doctor to see what was wrong. Sentence3: She had a stuffed up nose and a hacking cough. Sentence4: The doctor gave her some medicine and a note for her school. Sentence5: Tina stayed home and in bed sick for the whole day.
Tina, Doctor