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.

[EX Q]: Sentence1: Karen liked a diner in her town. Sentence2: She loved their burgers. Sentence3: The diner changed their recipe for the burgers. Sentence4: Karen didn't like the new recipe. Sentence5: She stopped going to the diner.
[EX A]: Karen

[EX Q]: Sentence1: My sister is afraid of spiders. Sentence2: She jumps and screams every time she sees one. Sentence3: I love teasing her with spiders and watching her run away. Sentence4: At school, my sister learned about spiders and was no longer afraid. Sentence5: Now I can't have fun teasing her about spiders.
[EX A]: I (myself), My sister, Spider, Spiders

[EX Q]: Sentence1: Matilda loves unicorns. Sentence2: One day she saw a pair of leggings with unicorn print. Sentence3: She really wanted the leggings. Sentence4: After researching, she was able to purchase them. Sentence5: Matilda is blissfully happy in her new leggings.
[EX A]:
Matilda