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.

Ex Input:
Sentence1: Lee knew her mom needed new gloves and could not afford them. Sentence2: So Lee began to knit a pair. Sentence3: Then she presented them to her mom. Sentence4: Lee's mom was proud of her daughter for being so thoughtful.

Ex Output:
3, She hurried to finish them by Christmas.

Ex Input:
Sentence1: She has a test next week about Photosynthesis. Sentence2: The information is complex and in depth. Sentence3: She wrote a song about it to memorize the material more easily. Sentence4: Her song helped her and she then did well.

Ex Output:
1, Amy is enrolled in an advanced Plant Biology course.

Ex Input:
Sentence1: Ken was on vacation in the tropics. Sentence2: He was learning to scuba dive. Sentence3: Soon he was learning lots of facts about the ocean and exploring. Sentence4: It was the best vacation Ken had ever taken.

Ex Output:
3, He passed his certification course and then dived every day.