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.
Input: Title: Dead Pet. Sentence 1: He left it home alone since it was only a couple of days. Sentence 2: He couldn't find anybody to take care of his dog. Sentence 3: Tom was going on a business trip. Sentence 4: The dog got itself stuck by the collar while Tom was gone. Sentence 5: It accidentally suffocated to death.
Output:
31