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: Hank practiced his guitar to play in a jazz band. Sentence2: He got on stage with the group for his first performance. Sentence3: Hank was very nervous but thought he'd done well. Sentence4: He looked into the audience to see what they thought. Sentence5: They clapped in approval at what he'd played.
Example Output: Hank, The group, The audience

Example Input: Sentence1: The man bought a skateboard. Sentence2: He rode the board down the street. Sentence3: One of the wheels fell off. Sentence4: He took the board back to the shop. Sentence5: He asked the shop to fix it.
Example Output:
The man