Running Select results in error 000210

I'm trying to run SELECT in order to extract specific features under "CLASS_NAME", but continue getting "ERROR 000210: Cannot create output".

I've searched though other questions with the same error but to no avail. http://ift.tt/1NdL9to

from arcpy import env
env.workspace = "C:\input"
arcpy.Select_analysis("oldpoly.shp", "C:\output\newpoly.shp", '"CLASS_NAME" = item1,item2,item3')

Still getting to know Python and learning how to troubleshoot. I appreciate any advice.