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.
--------
Question: Sentence1: Tom wanted to secure his future. Sentence2: He decided to learn how to program. Sentence3: He google searched for days to determine the best language. Sentence4: He decided that Ruby was the best programming language for him. Sentence5: He bought books on Ruby and worked hard, he learned Ruby well.

Answer: Tom

Question: Sentence1: Casey was a secretary at a leasing office. Sentence2: There was a new hire, Savannah, whom Casey quickly became friends with Sentence3: Until the day Casey was running about one hour late to work. Sentence4: Savannah called the boss to tell on Casey. Sentence5: Casey and Savannah are not friends anymore.

Answer: Casey, Savannah, Boss

Question: Sentence1: Julie was struggling in Calculus. Sentence2: She needed a C on the final exam to pass the class. Sentence3: She studied for many hours. Sentence4: When she sat down to take the exam, her mind went blank. Sentence5: She failed the exam and the class.

Answer:
Julie