Q: 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'.
Title: Fear of Dogs. Sentence 1: After a few months of therapy Justin felt better around dogs. Sentence 2: Justin was terrified of dogs. Sentence 3: His girlfriend had a dog and he wanted to feel comfortable with it. Sentence 4: Justin went to therapy to help him get over his fear. Sentence 5: Justin then moved in with his girlfriend and her dog.
A:
23415