IronPython script which retrieves selected cells from an opened excel sheet and figures out the number of occurences for each of the letters used

IronPythonCharCounterExcel.py

import clr

# Not sure if the full qualified assembly name is needed - works for me if I omit it:
#clr.AddReferenceByName('Microsoft.Office.Interop.Excel, Version=11.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c')
clr.AddReference("Microsoft.Office.Interop.Excel")
from Microsoft.Office.Interop import Excel
from System.Runtime.InteropServices import Marshal
from collections import Counter

# The following IronPython script finds out how many alphabet-stickers my future wife needs for the wedding place cards
# It expects an excel instance to be opened and that the names of the guests are selected.
# It then concatinates all names and uses 'Counter' to find out how many instance of each letter occurs in the selected names
# Tested with Windows8.1, Excel 2013, IronPython 2.7.4 (2.7.0.40) on .NET 4.0.30319.34003 (32-bit)

# Get the active Excel Application to interact with it and retrieve the selected cells.
excel = Marshal.GetActiveObject("Excel.Application")
excel.DisplayAlerts = True
selection = excel.Selection
# Could also browse through the open workbook and filter rows without a selection
#excel = Excel.ApplicationClass()   
#excel.Visible = True
#workbook = excel.ActiveWorkbook
#worksheet = workbook.ActiveSheet
# TODO: I guess this is not very pythonic...
selectedWords = ''
for row in selection.Rows:
    for column in row.Columns:
        if column.Value2 is not None:
            selectedWords += column.Value2

result = Counter(selectedWords)
totalCount = 0
for key in sorted(result.iterkeys()):
    letterCount = result[key]
    totalCount += letterCount
    print "%s: %s" % (key, letterCount)

print "Total: %i" % totalCount
raw_input()