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: Packing for A Trip. Sentence 1: Mid trip jane realized she forgot something vital. Sentence 2: She tried to make sure to pack everything. Sentence 3: Jane was packing for her trip. Sentence 4: She was disappointed in herself. Sentence 5: Jane had to have someone mail it to her.
Output:
13