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.

Ex Input:
Title: Tree House. Sentence 1: Stewart and his friends had great fun with the tree house. Sentence 2: Stewart's dad built a treehouse for him in the back yard. Sentence 3: Stewart grew older and eventually had a son of his own. Sentence 4: There were no large trees in Stewart's back yard. Sentence 5: Instead of a tree house, Stewart built a fort for his son.

Ex Output:
12

Ex Input:
Title: Crabs. Sentence 1: Mark Salzman was a fishing boat captain. Sentence 2: One day he received word that cod prices had dipped. Sentence 3: He spent most of the season chasing cod. Sentence 4: So he spent a fortune re-rigging his ship for crabs. Sentence 5: Only to find out that those prices had tanked too.

Ex Output:
32

Ex Input:
Title: Literature vs math. Sentence 1: When it was time to choose a career path, he was indecisive. Sentence 2: Scott loved math and literature. Sentence 3: He could make more money teaching math than writing books. Sentence 4: But his love of books was too strong to deny. Sentence 5: In the end he chose to write articles about math problems.

Ex Output:
12