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: Amy and her friends thought it would be fun to sneak to the park. Sentence2: They had been there an hour talking to boys. Sentence3: Amy was afraid it was late, and they would be caught. Sentence4: She stood to announce to her friends they needed to leave. Sentence5: She turned, and Ben kissed her quickly before he headed home.
Amy, Boys, Ben, Friends