Q: 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: Parker Pens. Sentence 1: They were very expensive, being made from gold and silver. Sentence 2: Parker made pens for the business elite. Sentence 3: Each pen he sold netted him upwards of $1,000. Sentence 4: Parker's secret was that each pen held a microphone. Sentence 5: He stole trade secrets from the businesses using the microphones.
A:
12