Beginner question.

I have an assignment for school and have been wondering.

The assignment states it wants us to take input like:
please enter a command:a(5,3)
please enter a command:a(3,11)
please enter a command:a(7,22)

What do i do to get it to look at both the letter as the command and the letters inside of the brackets only for a formulate that the command a does?

You'll have to take the input as a string and then parse it yourself, checking for which function (if there is more than just 'a'), then making sure there is a '(' (and print an error if there isn't), then converting the numbers to integers.