When you prepare your homework file that you will submit in Blackboard, please do the following 
to keep the format as plain text (.txt), making it possible for me to grade it:

If you are typing your HW document on Windows:

* The simplest and BEST way is to type your program in Notepad (or copy/paste it from SAS into Notepad), the simple text editor
  that is available in all Windows versions.  Saving it in Notepad creates a .txt file.
* Otherwise, if you type the program in Word, be sure to choose File --> Save As --> Plain Text (*.txt).
  Even this can cause some weird formatting with quote characters, though, so using Notepad is best.

If you are typing your HW document on a Mac:

* First of all, type your program in TextEdit (or copy/paste it from SAS into TextEdit), 
  which is the Mac equivalent of Notepad.
* To make it a plain text file, go to the menu "Format" and choose "Make Plain Text".  Then save the file.