Definition: 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: I played an April Fools joke on my friend in 2007. Sentence2: She is a yoga teacher. Sentence3: I sent her a registered letter from a yoga institute. Sentence4: The institute offered her $500 to teach a one day class. Sentence5: She was very excited until she found out it was a trick.
Output:
I (myself), My friend