The Pile Diary

The security camera photographs the top of the pile after every single move. 📸

You get commands (add:x or take, takes valid). After EACH command print the current top — or empty if the pile is bare.

Example:

Input: commands = ["add:egg", "add:jam", "take", "add:tea"] Output:

egg
jam
egg
tea

After each command we report the new top: add:egg → egg on top, add:jam → jam on top, take removes jam so egg is on top again, add:tea → tea on top.