Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Mark decided he wanted to surprise his son with a cool gift. Sentence 2: He drew up plans for an excellent tree house to build in the backyard. Sentence 3: Mark got some friends together to build it all in one day. Sentence 4: When Mark's son got home from school, Mark showed him the gift. Sentence 5: The boy was incredibly surprised and thrilled at the amazing present.

The Terrific Treehouse