Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence1: Mark decided his cable bill was too high. Sentence2: He decided to cancel the service. Sentence3: Mark spent more time reading and doing puzzles. Sentence4: He saved a lot of money every month. Sentence5: Mark used the money he saved to take his girlfriend out.
Student:
Girlfriend, Mark