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: Gina and her friends were outside of the school library. Sentence2: They wanted to go inside. Sentence3: But the librarian was not in in the library. Sentence4: They decided to wait for her.
Output:
4, The girls weren't sure where she could be.