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.
--------
Question: Sentence1: Muriel and her sister always took the shortcut home. Sentence2: One day they decided to take the long way home. Sentence3: A strange man followed them and they got scared. Sentence4: They started running and screaming until they made it home. Sentence5: They told their parents and now they pick them up.

Answer: Strange man, Muriel's parents, Muriel's sister, Muriel

Question: Sentence1: Calvin was so excited! Sentence2: His friends were coming over for a birthday party. Sentence3: He cleaned his room and decorated the play room. Sentence4: They came over and brought him gifts. Sentence5: He had a great time!

Answer: Friends, Calvin

Question: Sentence1: Sue got in her car and frowned at how filthy the window was. Sentence2: Her dog's nose had made quite a mess of the glass. Sentence3: She wondered if he had worked hard to create that window art for her. Sentence4: Sue sort of felt bad as she cleaned it away. Sentence5: The next day, her dog created a new masterpiece on the window.

Answer:
Sue, Dog