The theme of good triumphing over evil appears in many classic fairy tales, such as "Snow White and the Seven Dwarfs" and "Goldilocks and the Three Bears." Which of the following stories uses this same theme?
W. A fire-breathing dragon is about to wipe out a mountain town, but Wilford the Wise arrives just in time and tricks the dragon into thinking the townspeople are demons. The dragon runs away scared and never comes back.
X. A young man falls asleep for 100 years, and when he wakes up, he cannot find his home. His mother has been searching through time to find her son, and at last she finds him.
Y. A poor boy, Jonathan, switches places with a rich boy, Jacob, who looks just like him. They each learn about each other's lives and decide they want their old lives back.
Z. A miserly old king won't give his daughters any of his treasures until they prove that they're virtuous. Each daughter goes out into the world to prove this, except for the youngest daughter, Lilith, who stays and takes care of her old father. Lilith is the one the king rewards with all his riches, which she decides to share equally with her sisters.