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: The people were working in their yard. Sentence2: They were building a big, tall fence. Sentence3: They wanted a nice space for their dog to run around in. Sentence4: They worked all weekend to finish it. Sentence5: When they were done, they stepped back and admired their work.
Output:
Dog, People