You will be given a definition of a task first, then some input of the task.
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: Howard liked to tell stories about make-believe things. Sentence2: One day he told a story to his mom about pixie's. Sentence3: His mother was very impressed and told him to write the story down. Sentence4: He did and showed it to his teacher the next day. Sentence5: Howard got an A+ on that writing assignment that week.
Output:
Teacher, Mom, Howard