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: The mom really wanted to get the boy's picture with Santa. Sentence2: The boy was scared and refused. Sentence3: This changed the boy's mind. Sentence4: The boy hoped to get lots of presents from Santa!
Example Output: 3, The mom told the boy that Santa was responsible for bringing presents.

Example Input: Sentence1: Gina was given lunch detention. Sentence2: She was expecting worse. Sentence3: She didn't want the principal to know she was relieved. Sentence4: Gina's smile broke into a laugh but the principal didn't notice.
Example Output: 3, She fought the smile that tried to creep across her face.

Example Input: Sentence1: The cat chased the mouse across the empty warehouse. Sentence2: Running in fear, the rodent moved as fast as it could. Sentence3: The larger feline stayed close behind. Sentence4: The mouse got away.
Example Output:
4, It was terrified.