Given the task definition and input, reply with output. 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.

Sentence1: John wanted to climb a mountain. Sentence2: John took a class on climbing at his YMCA. Sentence3: John bought a ton of mountain gear. Sentence4: John got on a plane and flew to Mount Everest.
John successfully reached the summit.