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.
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Question: 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.

Answer: Joseph, Sara, Guest

Question: Sentence1: My science class took a field trip to the bio park today. Sentence2: Only about half of the students were allowed to go on the trip. Sentence3: My best friend Mark got left behind because he failed a math test. Sentence4: That doesn't seem fair to me because he is really good at science. Sentence5: I don't understand why teachers punish students who really try hard.

Answer: Students, I (myself), Teachers, Mark

Question: Sentence1: Jake was trying to mop the floor. Sentence2: He noticed it kept looking dirty. Sentence3: Eventually he figured out the problem. Sentence4: The bucket he was using was terribly dirty. Sentence5: He cleaned it out and was able to mop properly.

Answer:
Jake