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: Mark and Jim went out fishing so they could have something for dinner. Sentence2: The two worked hard but it was hot and there were no fish. Sentence3: Jim suggested trying a new spot in the shade. Sentence4: The new spot worked and they brought in half a dozen fish. Sentence5: That night they had a delicious meal they were proud of.

Answer: Jim, Mark

Question: Sentence1: Tim was going to drive a friend home. Sentence2: The friend had too much to drink. Sentence3: He couldn't get the friend's keys to work. Sentence4: The friend was too drunk to help. Sentence5: He had taken the wrong keys by accident.

Answer: Tim, Friend

Question: Sentence1: Katie was getting mad at her boyfriend Tom. Sentence2: They had been together for five years and no engagement. Sentence3: Katie was getting antsy. Sentence4: Then to her surprise, tom proposed to her at her favorite restaurant. Sentence5: Katie was thrilled.

Answer:
Tom, Katie