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: Cassie was a vegetarian and had just been invited to a cookout. Sentence2: She feared her friends would mock her when they found out her secret . Sentence3: But she decided to go anyways and try to have fun. Sentence4: At meal time, Cassie got a big surprise. Sentence5: There was chicken, ribs - and tons of veggie burgers!
Cassie's friends, Cassie