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: Sara and Joseph were planning their wedding. Sentence2: They were on a tight budget. Sentence3: They couldn't afford a three tiered cake. Sentence4: Sara ordered a one tier cake and baked matching cupcakes. Sentence5: The cupcakes were a big hit amongst the guest.
Output:
Joseph, Sara, Guest