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: Rachel was riding her new bike for the first time. Sentence2: She was excited to try it. Sentence3: She took off the training wheels and hopped on. Sentence4: As she got on, she immediately lost balance and fell. Sentence5: She scraped her knee but thankfully it was benign.
Example Output: Rachel

Example Input: Sentence1: Kathie fell from her bicycle. Sentence2: She bumped her head pretty hard on the ground. Sentence3: Kathie stood up dazed. Sentence4: A stranger escorted her to a hospital. Sentence5: Kathie was treated for a mild concussion.
Example Output: A stranger, Kathie

Example Input: Sentence1: A friend of mine is always testing his luck with the law. Sentence2: He rather sell drugs than get a job. Sentence3: The last I heard is he started to traffic across state lines. Sentence4: Yesterday the DEA came looking for him. Sentence5: Later in the evening news he was arrested with drugs.
Example Output:
I (myself), Dea, Friend