If a student receives a grade of a 90 or above, print out "you get an A."
If a student receives a grade of 80 or above, print out "you get a B."
If a student receives a grade of 70 or above, print out "you get a C."
If a student receives a grade of 60 or above, print out "you get a D."
If a student receives a grade of 50 or above, print out "you get an F."