InterfaceName property

I'm trying to use this code snippet to loop through the VLAN interfaces on routers to change IP Helper addresses.   The problem is that the InterfaceName property includes a dash in the name so you can't use it in a script.

For example  It returns VLAN-10 instead of VLAN10

Anyone have a work around?  I need to get this script working for a couple hundred switches before the weekend change.

Thanks!

  // Loop through selected interfaces

  foreach (@interfaceItem in @ContextNode.Interfaces)

  {

     if (@interfaceItem.InterfaceName contains 'VLAN')

  {

  CLI

  {

   interface @interfaceItem.InterfaceName

  }

  CLI

  {

         ip helper-address 10.0.252.10

         ip helper-address 10.0.252.11

         no ip helper-address 10.101.6.158

         no ip helper-address 10.101.6.159

         no ip helper-address 157.142.8.10

         }

  CLI

  {

    exit

  }