# 5.23:  Given the following dict of dicts, sort the dict keys by the last name.  Loop through and
# print each key.

people = {  '12345': { 'fname':  'Joe',
                       'lname':  'Wilson',
                       'addr':   '12345 Main Street' },

            '00355': { 'fname':  'Marie',
                       'lname':  'Adams',
                       'addr':   '888 Elm Street' },

            '98973': { 'fname':  'Alex',
                       'lname':  'Wilson',
                       'addr':   '23 Marsh Avenue' }
}

# your code here

