#  efficient.py:
 #  Author:  James Tam
 #  Port to Python 3.X: September 15, 2011
 #  Original version: January 25, 2008
 
 #  A program that conerts a letter grade to numeric GPA.   
 #  Note: This program is more efficient than the inefficient
 #  version because once the first GPA match is found the other 
 # cases won't be checked.

letter = input("Enter whole letter grade (A,B,C,D,F): ")
gpa = -1

if (letter == "A"):
    print("Great job!")
    gpa = 4

elif (letter == "B"):
   print("Good job")
   gpa = 3
   
elif (letter == "C"):
   print("Average grade")
   gpa = 2

elif (letter == "D"):
   print("Min pass")
   gpa = 1

elif (letter == "F"):
   print ("Failing grade")
   gpa = 0

else:
   print ("GPA must be one of 'A', 'B', 'C', 'D' or 'F'")
   
print ("GPA: %d" %gpa, "\t", "Letter: %s" %letter)