Your program is required to read a single line of input from the user (without printing any input prompt), which is expected to be a positive integer n (i.e., n will be neither zero nor negative). You can freely assume that your program will be given a positive integer, and it's not important what you do in any other case; we'll only test your program with positive integer input. You can also freely assume that n will not be greater than 999.

After reading the input, your program will print a downward block diagonal of size n. The precise format of a downward block diagonal is best demonstrated with an example. If the input to the program was 4, the output would look like this:

+-+ | | +-+-+ | | +-+-+ | | +-+-+ | | +-+ 

A few additional requirements apply:

Though I've indented the text above to set it apart from the rest of the project write-up, note that the left edge of the topmost block must begin in the leftmost column of the output (i.e., it should not be indented at all).

Python:

There must be no whitespace (e.g., spaces or tabs) at the end of each line of output.

There must be a newline on the end of each line, including the last one.

This is a complete specification of the structure of a downward block diagonal; the description is enough to solve the problem, so we will not be answering any additional questions about its structure. However, we are providing a tool that will give you a basic understanding of whether your program is reading the correct input and generating output in the correct format.