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: Mary was buying a pair of shoes for her daughter. Sentence2: Her daughter wasn't with her. Sentence3: Mary bought the size of shoes she thought would fit. Sentence4: The shoes didn't fit her daughter. Sentence5: Mary had to return her shoes to the store.
Mary, Mary's daughter