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: Ace was a cable installer. Sentence2: He had a few installations setup for today. Sentence3: Ace knocks on the front door of his first stop. Sentence4: A sweet old lady answers the door. Sentence5: Ace installs her cable and is very nice to the older lady.
Output:
Old lady, Ace