line one
     string two, string three
123 456 789
 
INPUT #5, WORDS$

Answer:

The string read into the variable is "string two" without any spaces at either end, but containing one space in the middle (and not containing the quote marks).

Reading up to a Comma

The characters from the second line, up to the comma, are read into the variable WORDS$. The leading spaces and the comma itself are not included in the string assigned to the variable.

Another execution of the statment

 
INPUT #5, WORDS$

will read in the characters "string three" with no spaces at either end. Now everything except the characters on the third line has been read.

QUESTION 15:

What is read in when

 
INPUT #5, WORDS$

is executed again? (Hint: this is a trick question.)