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.

Example Input: 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.
Example Output: Casey, Savannah, Boss

Example Input: Sentence1: Sally was desperate for money. Sentence2: She needed to pay rent and was backed up on bills. Sentence3: She took out a payday loan to keep afloat. Sentence4: Now she is further in debt and more desperate. Sentence5: She contemplated suicide when she was evicted.
Example Output: Sally

Example Input: Sentence1: Tom's old sofa had a bad smell. Sentence2: He couldn't afford to buy a new one. Sentence3: He tried washing it but it didn't work. Sentence4: Tom bought air fresheners instead. Sentence5: They covered up the smell for a while.
Example Output:
Tom