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: Amanda was about to enjoy a weekend of camping with her boyfriend. Sentence2: Upon arrival, Amanda saw a sign warning of bears. Sentence3: Amanda never saw a bear, and was scared at the thought of seeing one. Sentence4: After getting inside the tent, Amanda heard loud noises outside. Sentence5: Amanda got scared, but realized her boyfriend was playing a prank.
Output:
Bears, Amanda, Bear, Boyfriend