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: Close. Sentence 1: Kate was standing on a kids chair to reach a high shelf. Sentence 2: She was trying to get off the chair. Sentence 3: She jumped off the falling chair to keep from falling. Sentence 4: But the chair began to flip. Sentence 5: She sat on the chair laughing with her hand over her racing heart.
A:
43