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: Francis Found A Squirrel. Sentence 1: The squirrel wasn't afraid of him and approached him. Sentence 2: Francis found a squirrel in his college's student yard. Sentence 3: He had some nuts in his backpack, so he offered them to the squirrel. Sentence 4: The squirrel took them and now shows up when Francis is in the yard. Sentence 5: Francis regularly feeds the squirrel almonds he brings.
Output:
21