Teacher:In this task, you're given the title of a story consisting of five sentences, numbered 1 through 5. Your job is to determine which two sentences need to be swapped sentences in order to make a story that makes complete sense and is befittingly titled. Indicate your answer using the numbers of the two sentences in order, such as '34' or '25'. The first digit refers to the sentence which should come first in the story.
Teacher: Now, understand the problem? Solve this instance: Title: Nervous Dinner. Sentence 1: He later learned he was a hit with his girlfriend's parents! Sentence 2: Tom was nervous but agreed. Sentence 3: Tom wasn't sure how to talk during the dinner. Sentence 4: After dinner, Tom thanked them all for a lovely meal. Sentence 5: Tom's girlfriend asked him to have dinner with her and her parents.
Student:
15