Someone

        App_height1=root.winfo_geometry()
        App_height = re.sub('\+[0-9]\+[0-9]', '', App_height1, count=0)
        App_height=re.sub ('[0-9]+x', '', App_height)
        print App_height

""" output

718+341+41
718+341+41
718+341+41
718+341+41
718+341+41
718+341+41

from command line
>>> foo="610x349+1+1"
>>> foo = re.sub('\+[0-9]\+[0-9]', '', foo, count=0)
>>> print foo
610x349
>>> foo = re.sub ('[0-9]+x', '', foo)
>>> print foo
349
>>>