Have them email you the answer instead. You can either view it now or have them email it to you. Use this option that way there will be no need for you to enter the answer to your question! I tested it out and it worked for me.
Hope this helps!
Here is the link to Iwon support, I apologize that I did not fully understand your initial question. I was under the impression that when you attempted the answer to your hint question it was giving you an error. With the above link you can contact support and they can assist you with getting in to your account.