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: The Cute Girl. Sentence 1: She left without him saying anything. Sentence 2: He noticed a really cute girl there too. Sentence 3: He kept trying to build up the courage to talk to her. Sentence 4: Tim was never really able to. Sentence 5: Tim was at the laundromat.
Output:
51