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.
Q: Title: Writing a paper.. Sentence 1: I had a big paper due last month for class. Sentence 2: I can't wait to write another paper for class. Sentence 3: I spent a lot of time to make sure my grammar was good. Sentence 4: I turned the paper in early and got a good grade on it. Sentence 5: I love writing papers so I was happy to do it.
A:
25