Detailed Instructions: In this task, you're given the title of a story consisting of five sentences, numbered 1 through 5. Your job is to arrange the sentences in order to make a story that makes complete sense and is apt for the title. Indicate your answer using the number of the sentences in order, such as '34152'.
Q: Title: Helpful. Sentence 1: Luke studied for his exam in the library. Sentence 2: His friend found Luke there. Sentence 3: His friend copied the notes to take home for the night. Sentence 4: Luke gave his friend some notes to study. Sentence 5: He asked Luke for help on the exam.
A:
12543