Given the task definition and input, reply with output. 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.

Sentence1: Amy went to the grocery store after work. Sentence2: She had a short list of items to buy. Sentence3: The store was out of half the items. Sentence4: After that she was able to go home and cook a good meal.

4, Amy had to go to a second grocery store.