Definition: In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.
Input: Sentence1: Seth was a great painter who wanted to learn to play guitar. Sentence2: He couldn't afford guitar lessons, but the teacher offered a trade. Sentence3: If Seth would teach him to paint, he would teach Seth to play guitar! Sentence4: Seth agreed happily.

Now he's a great guitarist and his teacher is a great painter!