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: Sam's glasses broke while he was playing football. Sentence2: They snapped in half right in the middle. Sentence3: Sam had to use tape to hold them together. Sentence4: He was embarrassed - until his brother said he resembled Harry Potter! Sentence5: Then Sam was proud of his cool, stylish glasses!
Output:
Brother, Harry potter, Sam