Write a program that takes a mathematical expression of the form $($a $+$ b$)^2$

or $($a $$ b$)^2$ and calculates its result. Unlike problem $1,$ the user will enter the entire

expression in a single input. Your program will need to parse the input, extract a and b

and the type of operation $($addition or subtraction$)$ and then compute the result of the

operation. You can assume a and b will be integers. It only needs to handle expressions

of this type; you do not need to implement a generalized program that can calculate any

arbitrary function