Instructions: 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.
Input: Sentence1: Roy was in a bad mood. Sentence2: So he decided to clean his messy house. Sentence3: He put everything in the right order. Sentence4: And everything was free of dirt and dust. Sentence5: Roy was happy to see his house cleaned up.
Output:
Roy