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: Harry went to the theme park with his family. Sentence2: He then rode on some smaller rides with his mom. Sentence3: The family ate at a restaurant at the park. Sentence4: Harry had a great time at the park.
Example Output: 2, His dad and brother rode on a big roller coaster with him.

Example Input: Sentence1: She was unsure as to whether she should open the door or not. Sentence2: Slowly she creaked open the door and peered outside. Sentence3: Her brother leaped out at her and gave her a good scare. Sentence4: She screamed and pushed her brother away.
Example Output: 1, The doorbell rang but no one was there.

Example Input: Sentence1: They sold a glass of lemonade for a quarter each. Sentence2: They sold sixteen glasses in one day to people. Sentence3: Tommy wasn't sure how to split the profits, so Billy helped. Sentence4: They shared the money equally.
Example Output:
1, Tommy and Billy started a lemonade stand.