Fair enough. At cepro.com, we ask posters to enter (for example) the second letter of the word "cat."
But this particular site expects you to answer a complex math problem. What about us algebraically challenged? Not to fear, the site provides a sample math question -- like a practice quiz -- to help you out:
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.And, lest you don't know what a "math problem" is, you are directed to a site that explains the concept.
After quite some time, I was finally able to post my comment.