Core Python Programming, chapter 5 exercises number 5-3, question on this exercise

[John Warney]

I have read pretty much every page of the book till now.  On this
question it says to take a test score input from the user and output
letter grades acording th the following scale/curve......

The issue i am having is the book hasnt covered standard input yet.
If i am wrong please correct me b/c i am stumped on this question and
most like the others until i find out from reading the rest of the
book.

Rob