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: Sam hopped into his mail truck and drove off. Sentence2: He drove so fast he didn't see a pothole in the road. Sentence3: The truck bounced hard when he hit the pothole. Sentence4: Sam's head hit the steering wheel.
Example Output: 2, He was trying to do his route fast to get home early today.

Example Input: Sentence1: Ellie wanted a fish tank. Sentence2: She went and bought a big aquarium. Sentence3: Then she filled it with fresh clean water and gravel. Sentence4: Lastly, she added her fish.
Example Output: 5, Ellie thought it looked great.

Example Input: Sentence1: Seven-year-old Ben went to play at his friend Mike's house. Sentence2: Mike greeted Ben, and they went to play in Mike's room. Sentence3: First, they played with Mike's quadcopters for a long time. Sentence4: Then, they played with some trucks.
Example Output:
5, They had a good time together.