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: Efficient Holiday. Sentence 1: Kyle and Kim went to Madrid for a holiday. Sentence 2: They went with only each other to maximise their time. Sentence 3: This time, they did everything they wanted to do with time to spare. Sentence 4: People would always end up losing out because of others' choices. Sentence 5: This was because they didn't enjoy the dynamics of a big group.
A:
35