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.

Example Input: Sentence1: Yesterday Kelly headed to cvs to buy some candy. Sentence2: To her surprise however, she ran into an old friend. Sentence3: The two talked for awhile. Sentence4: Her friend ended up buying the candy for her.
Example Output: 2, She walked up and down the aisles to find what she wanted.

Example Input: Sentence1: I needed one for my cell phone. Sentence2: The case arrived without a lanyard. Sentence3: The website said the case had a bracket but not a lanyard. Sentence4: I felt foolish.
Example Output: 1, I bought a phone case with a lanyard.

Example Input: Sentence1: Liv jumped as she was startled by a loud pop. Sentence2: She realized it was the light bulb in her kitchen burning out. Sentence3: She got out a footstool and stepped on to it. Sentence4: Liv then changed the light bulb.
Example Output:
4, It wobbled under her and she almost fell.