It'll return false, as it wouldn't be a valid tail: make sure that the second argument (tail), is the same as the last letter of the first argument (body)

I just submitted a Ruby solution and it worked just fine. You may need to make sure that you don't have anything blocking the scripts on that page. The Submit button should change to a "Submit Final" button after the first press. If that still doesn't work, post your code here and I will give it a try.