Given the task definition and input, reply with output. In this task, you're given four sentences of a story written in natural language in which one part is missing. Your job is to predict the position and missing part of the story and return in the following format: position, missing part. The missing part is a sentence that completes the story, and the position is the number of the missing sentence in the new story.

Sentence1: I've always wanted to be able to bike thirty miles at one time. Sentence2: Right now I can only bike about twenty miles at once. Sentence3: I got myself a biking trainer who helped me make progress. Sentence4: I worked hard for a few months and ate all the right foods.

5, Now I can bike 30 miles.