List Sort with Set Difference

I’m fairly new to Dynamo but I’ve been trying to take the existing sheets from Revit and reference them with a sheet list from Excel. It works except for sheets that have a ‘G’ in the prefix. Not sure what is so special about ‘G’. Any ideas?

Hi Derek,

It works fine for me.


Seems to work as expected for me…


It worked when I recreated the problematic sheet number columns in Excel. Not sure why but so far so good. Thanks.