The Paint Layers

The fence has been painted and re-painted for years — peel to see history, paint to bury it. 🎨

You get commands — paint:red or peel (peels always valid). Print the color showing at the end, or bare wood if every layer is gone.

Example:

Input: commands = ["paint:red", "paint:blue", "peel"] Output: red

blue was painted on top of red. Peeling removes blue, so red shows through again.