Powershell script and sensor

Hi, i have a powershell script that returns two values "OK!" and "Failure". How can i now use it in the PRTG EXE/script sensor?

$dir = "myDirectory"
$filter = "*.log"
$searchstring = "Status"

$latestfile = Get-ChildItem -Path $dir -Filter $filter | Sort-Object LastAccessTime -Descending | Select-Object -First 1 

$lastlines = Get-Content -Path $latestfile.FullName -Tail 5
$sel = $lastlines | select-string -pattern $searchstring

If ($sel -eq $null)
{ 
    Write-Host "Failure"
    Exit 2
}
Else
{ 
    Write-Host "OK!"
    Exit 0 
}

Thanks

powershell prtg sensor