Instructions: 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.
Input: Sentence1: Jeff is excited and can't wait to go. Sentence2: When Jeff arrived he was very disappointed. Sentence3: The rainy forest wasn't exciting and there was nothing to do. Sentence4: Jeff was bored and upset.
Output:
1, Jeff is going on a field trip to the rainy forest with his class.