alphametics: Update example solution to be more performance efficient  (#1068)
alphametics: Update example solution to be more performance efficient  (#1068)


smalley/python,pheanex/xpython,behrtam/xpython,jmluy/xpython,jmluy/xpython,pheanex/xpython,behrtam/xpython,exercism/python,N-Parsons/exercism-python,exercism/python,N-Parsons/exercism-python,smalley/python,exercism/xpython,exercism/xpython