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: Mr Ben required anyone passing a note to read the note to the class. Sentence2: Sarah was passing a note to Tom. Sentence3: But she was caught. Sentence4: Sarah got in front of the class and read the note. Sentence5: Mr Ben's surprise party was ruined.
Mr ben, Sarah, Tom