Get-ADComputer convert to INT

Hello all,

I try to convert a result from request with powershell module Get-ADcomputer. I would like to generate new computer name by checking Computers name in AD and increment the number. My machines name are like : "desktop0001, desktop0002....

my script :

*******************************************************

# REQUEST FROM AD

$adcheck = Get-ADComputer -Filter 'Name -like "DESKTOP0*"' | select Name 

# KEEP ONLY THE LAST AD RESULT

$LastVM = $adcheck | select -Last 1 Name

# CONVERT TO STRING

$newname = $LastVM.Name | Out-String

#SPLIT DESKTOP NAME TO KEEP NUMBER TO INCREMENT

$a = $newname.split('DESKTOP')

Write-Host $a

$INT = [int]$a -> give some error

***************************************************

i tried some other ways without any luck

please help ^^

thanks