You have to declare the dictionary on your own

What is the name of the dictionary so that i can call it in my code?

"My code doesn't work" enquiries are not an issue, a question.

Nothing can be done unless you provide information such as:

• Language version
• The input
• Your code (in spoilers)

My code gives the output ()()() but it says it is incorrect as it is looking for '()()()'

Yes. A cube is particular case of a cuboid.

is this for a cube or cuboid box?