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: A piece of cake. Sentence 1: I first learned to ride my bike with my mom. Sentence 2: In our backyard was this huge hill and at the bottom, several trees. Sentence 3: I practiced by going down this hill towards the trees. Sentence 4: I hit those trees many times but I finally learned to ride my bike! Sentence 5: If I wanted to save myself bad enough I would ride properly.
Output:
45