Python 3.6.3 (v3.6.3:2c5fed8, Oct  3 2017, 17:26:49) [MSC v.1900 32 bit (Intel)] on win32
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>>> 
if grade>=90:
	lettergrade=a
elif grade>=80:
	lettergrade=b
elif grade>=70:
	lettergrade=c
elif grade>=60:
	lettergrade=d
else:
	lettergrade=f
	
