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: Dancing after work. Sentence 1: And she told everyone at work how dancing was good for her health. Sentence 2: Every evening after work she'd get home and dance. Sentence 3: She didn't realize how good it was for her to get fit. Sentence 4: But after a few months she had lost fifteen pounds. Sentence 5: Sheena loved to dance.
Output:
15