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: Maria was supposed to pay her water bill one day. Sentence2: She didn't make it into the office before they closed. Sentence3: Instead she went in first thing the next morning. Sentence4: Unfortunately they had to charge her a late fee. Sentence5: She argued at first but eventually gave up and just paid.
Maria