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: Writer's Block. Sentence 1: Ralph had to write a story for his English class. Sentence 2: He came down with a case of writer's block. Sentence 3: Try as he might, no ideas would come to him. Sentence 4: He turned in the story and got a good grade. Sentence 5: He decided to write a story about how he couldn't write a story.
54