You will be given a definition of a task first, then some input of the task.
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: Gun?. Sentence 1: He kept the gun unloaded, in his bedroom nightstand. Sentence 2: John bought a handgun for home protection. Sentence 3: One night, John heard a noise. Sentence 4: In case it was an intruder, John grabbed the gun. Sentence 5: It was just his teen son, but John felt comforted by having the gun.
Output:
12