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: