Detailed Instructions: 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.
Q: Title: Ramen. Sentence 1: He would go to a local restaurant that made it his favorite way. Sentence 2: His favorite was ramen. Sentence 3: Nathan liked eating ethnic foods. Sentence 4: He loved slurping the broth and eating the vegetables. Sentence 5: Nathan thought he could eat the ramen every day of the week.
A:
13