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.
Q: Sentence1: Peter went to the grocery store one day. Sentence2: He picked up fruits and vegetables. Sentence3: He went to pay at the cashier's desk but he forgot his wallet. Sentence4: He spent 5 minutes searching, but could not find it. Sentence5: He had to put everything back and come back to the store later.
A:
Peter, Cashier