Powershell Variable from Excel.VBA Macro

Question

Hi Guys!
I don't know if what i'm asking you is achievable.
I've learned how to pass variables/arguments from powershell to Excel/VBA Macro but i need to do the opposite thing.
This is an example of what  i want:
Powershell                                                                      
                   Excel/VBA Macro
$Input=1   ---------------------------------------------------------------->   Sub Macro(input)
$excel.Run("Macro",$Input)                                                              
  Output=input +6
$output (Expected 7)   <----------------------------------------------------  return Output
I don't know how to do this can you help me please?
A

Answer 1

Ok guys those are the script.
Macro:
Sub CreatePWD()
Dim PWD As String
Dim i As Integer
Dim Max As Integer
Dim F1 As Worksheet
Set F1 = ThisWorkbook.Worksheets("Foglio1")
Max = F1.Range("A1").Value
For i = 1 To Max
If Int((2 * Rnd) + 1) = 1 Then
PWD = PWD & Chr(Int((90 - 65 + 1) * Rnd + 65))
Else
PWD = PWD & Int((9 - 0 + 1) * Rnd + 0)
End If
Next i
MsgBox PWD
End Sub
Powershell:
$Excel = New-Object -ComObject excel.application
$Excel.visible=$false
$Version = "C:\Users\Alberto Corona\Desktop\Cartel1.xlsm"
$WorkBook= $Excel.workbooks.open($Version)
$WorkSheet= $WorkBook.worksheets.item(1)
$WorkSheet.cells.item(1,1)=5
$Excel.Run("CreatePWD")
$WorkBook.save()
$WorkBook.close()
$Excel.quit()
The result of macro is like "52UT7" i want a variable in powershell called $PWD that contain the value of the macro. 
Hope the problem is clear now.
Thanks
A