Given the task definition and input, reply with output. 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 took her purse into the bathroom stall and set it on the shelf. Sentence2: Without thinking, she exited the bathroom without her purse. Sentence3: Later she realized she didn't have her purse. Sentence4: She ran to the bathroom and found her purse. Sentence5: Unfortunately, her wallet had been emptied and she was sad.
Mary