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: Phone Service. Sentence 1: On Friday our landline phone died. Sentence 2: We thought it was the phone and replaced the batteries. Sentence 3: We called our service provider. Sentence 4: The phone was still dead. Sentence 5: They said the cable was down and it would take days to repair.
A:
43