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: Oliver needed a new radio. Sentence2: He didn't know anything about them, though. Sentence3: He had a friend help him pick one out. Sentence4: The friend was a pro and found him a good deal.

Oliver was grateful to his friend.