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: 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: Francis decided to do some baking. Sentence2: He couldn't decide what to bake. Sentence3: He thought about cookies, but decided not to. Sentence4: Finally, he made some croissants. Sentence5: They burned!
Example Output: Francis

Example Input: Sentence1: We were driving to the mall one day. Sentence2: I was listening to my favorite song on the radio. Sentence3: I was singing as loud as I possibly could. Sentence4: Just as I hit the highest note the song unexpectedly stopped. Sentence5: My wife had received a text and her bluetooth shut off my music.
Example Output:
I (myself), My wife