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: Sally entered a contest online and won some gift cards. Sentence2: The person in charge of prizes got her address and mailed them out. Sentence3: Sally got them in the mail a few days later. Sentence4: She found a cool item and then happily bought it.
Example Output: 4, She went online and decided what she'd like to buy.

Example Input: Sentence1: Celina is very old. Sentence2: Her hips are always sore. Sentence3: It is hard for her to walk. Sentence4: It helped her a lot.
Example Output: 4, One day, she obtained a walker.

Example Input: Sentence1: Bob knocked on the door and asked for Jenny. Sentence2: Jenny answered and walked outside to the car. Sentence3: Jenny and Bob drove to the movies. Sentence4: Bob kissed Jenny good night.
Example Output:
4, Bob and Jenny had a good time.