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: Jack's Run. Sentence 1: He laced up his shoes and headed out the door. Sentence 2: Jack decided he wanted to go for a run. Sentence 3: Jack ran for thirty seconds, but then he had to stop. Sentence 4: He walked back to his house, panting and wheezing. Sentence 5: Jack decided to sit on the couch and watch TV instead.
A:
12