Notification.
In your answer there are no leading zeroes and the length of your answer is equal to the length of corresponding number. (Otherwise possible WA4)

Hey, dude, thank you. I just wanted to make sure everybody understand what Evgeniy tries to explain here. If you have something like this
1
100200300400
your answer should be something like this
324100000000 (not 000000003241 and not 3241)
Good luck

Thank you!
I've got AC now.