You will be given a definition of a task first, then some input of the task.
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.

Sentence1: Joe was taking his son to a carnival. Sentence2: In the carnival Joe took his son to see a clown show. Sentence3: Joe's son loved seeing the clown. Sentence4: His son laughed at the clown. Sentence5: Joe was happy to see his son happy.
Output:
The clown, Joe's son, Joe