The Sticker Album

You dumped every sticker you own on the floor — tons of repeats! The album only needs one of each. 🌟

You get the sticker pile as items. Build a set from it and print how many DIFFERENT stickers you own.

Example:

Input: items = ["star", "moon", "star", "sun", "moon"] Output: 3

Dropping every item into a set removes the repeats, leaving {"star", "moon", "sun"} — 3 different stickers.