First and Last, Programming Exercise #11 on p. 280

Allow a user to enter a series of names. When they are done they will enter the name of 'DONE'.

Print out the name that comes first and last alphabetically (smallest and largest).

Note:

A sentinel controlled loop must be used. The user will enter a sentinel value of

"DONE" to indicate that there are no more names to be input. This is just like HW 7 but with strings rather than Integers.

THIS IS TO BE DONE IN PYHTON. DONT USE LISTS