The users receive the number in a letter that is posted to them.
The number then needs to be validated on the contact form prior to submitting, at wjhich point the admin and user will both receive notification.
The numbers are in sequence, so maybe this will work:
Range : Minimum and maximum number value user can input. Like: Age should between 18 – 60.
Use class JVrange-#-*. Where # is minimum numeric value required and * is maximum numeric value allowed.