Instructions: 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.
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.
Output:
The man