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: Sweater. Sentence 1: Karen was cold sitting in her apartment. Sentence 2: Her heater was malfunctioning, so heat wasn't an option. Sentence 3: She decided that she should wear a sweater instead. Sentence 4: She left that evening to go buy one at the mall. Sentence 5: She looked in her closet, only to find she didn't own one.
A:
54