### Extra practice assignment

At various points in the LPTHW exercises, I'll add my own assignments.
This is the first of these, to be completed after _Exercise 26_.

After you turn in your working program, I'll look for possible improvements, and ask
you to make some changes.

#### Specifications

Write a program that will produce verses of "Old MacDonald". It should work as follows:

    $ python oldmac.py duck quack
	Old MacDonald had a farm. E-I-E-I-O!
	And on that farm he had a duck. E-I-E-I-O!
	With a quack-quack here, quack-quack there, here a quack, there a quack, everywhere a quack, quack.
	Old MacDonald had a farm. E-I-E-I-O!

Notice in particular that the verse produced will make use of the command line arguments passed in `sys.argv`.

#### Things I'll look for

The main goal at this point is to have well organized, readable code. Using functions would probably
be good.

#### Future ideas

Some thoughts that would be challenging at this point:
- How could we change a/an when necessary?
- How could we do multiple verses with more arguments?