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.
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Question: Title: My Nephew Vacation. Sentence 1: The family received a visit from my nephew every year. Sentence 2: My nephew and i are very close. Sentence 3: Last Summer my nephew and i rode our bikes on a highway with hills. Sentence 4: Both of us came walking back with bruises and torn shirts. Sentence 5: While laughing and talking our bicycles collided with each other.

Answer: 54

Question: Title: Missed the Bus. Sentence 1: Sara was going to the grocery store on the bus. Sentence 2: She was running late and hurrying towards the bus stop. Sentence 3: Luckily she caught up with another later bus stop. Sentence 4: At first she wanted to give up but she decided to walk. Sentence 5: As she approached she saw the bus arrive, pass her and keep driving.

Answer: 35

Question: Title: Fixing the roof. Sentence 1: I got a ladder to fix it. Sentence 2: I noticed that the roof to my house was leaking. Sentence 3: I slipped off of the ladder and hurt my leg. Sentence 4: The pain made me howl loudly. Sentence 5: I learned that I should just call a professional next time.

Answer:
21