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: He shopped at the mall for hours and was unable to find anything. Sentence2: He came home disappointed and without a gift. Sentence3: His mother saw his face when he walked in and asked what was wrong. Sentence4: Dan explained the situation and his mother was not upset.
1, Dan wanted to find the perfect gift for his mother's birthday.