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: Zac thought he was the best at every athletic activity. Sentence 2: He and his new girlfriend went skiing together. Sentence 3: He challenged her to a race down the mountain. Sentence 4: He was shocked and angry when she beat him. Sentence 5: He didn't know she had been a ski racer when she was a teenager.

Skiing Challenge