The Third-Tallest Sunflower

The garden contest gives a special ribbon to the THIRD-tallest sunflower, just to keep things interesting. 🌻

You get at least three heights, all different. Print the third-tallest.

Example:

Input: heights = [150, 90, 120, 180] Output: 120

Sorted tallest-first gives [180, 150, 120, 90] — the third one down is 120.