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

Title: Pop Tarts. Sentence 1: I found some pop tarts but they were passed their expiration date. Sentence 2: All the cereal was gone. Sentence 3: Today I did not wake up in time to cook breakfast. Sentence 4: I decided to eat them anyway. Sentence 5: Now I have a belly ache.
13