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: I wanted to go on a cruise as I had never been on one before. Sentence2: For 2 years, I saved money every month from my paychecks. Sentence3: I went online to purchase a ticket for the cruise. Sentence4: The prices had increased dramatically compared to 2 years ago. Sentence5: I wasn't able to afford the trip, so I bought myself a tv instead.
Example Output: I (myself)

Example Input: Sentence1: The sink in my bathroom broke. Sentence2: I decided that I should fix it myself. Sentence3: After one hour, the sink looked worse than before. Sentence4: I finally decided to call a professional plumber. Sentence5: The plumber fixed the sink in ten minutes.
Example Output: I (myself), Professional plumber

Example Input: Sentence1: Since College, Mary has owned credit cards. Sentence2: She'll run up the limit but only pay the minimum payment each month. Sentence3: And she kept getting more and more cards. Sentence4: One day, after she turned 30, she decided she wanted to buy a house. Sentence5: She was denied a mortgage because of all her credit card debt.
Example Output:
Mary