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: Monica went to the store for her mother. Sentence2: When she got there, she saw a box full of puppies for sale. Sentence3: She stopped and picked up the cutest one. Sentence4: Monica forgot all about her mother's grocery list. Sentence5: She spent all of the grocery money on the puppy.
Monica, Puppies, The store, Her mother