HW
* If asking you to explain something in words (e.g., Problems 1 a and b), do not
  just put code.  I will take off for that next time.
* Cheating/copying/collaboration ...
* Grading based on good comments, etc. ...

HW1
* recursion to play the game many times...
* difference between break, continue, and doing recursion, or exit, ...

Today - 
* strings, lists, for loops.
* easy encryption/decryption - "caesar/rotation cipher"
* working with strings: +, [:], for loop, (they are immutable), lower, upper, find, 
  replace, type dir("hello") for a list of functions you can use