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elif

Nested conditions can get pretty deep very quickly. That makes reading the code difficult and programmers tend to avoid having many tested conditions (and having too much-nested code in general). Python provides utility elif that helps in avoiding else and then if statements:
if name == 'Alice':
	print('Hey there!')
else:
	if name == 'Bob':
		print('How are you doing?')
	else:
		if name == 'Anna':
			print('Hello, Anna')
		else:
			print('Hi!')
if name == 'Alice':
	print('Hey there!')
elif name == 'Bob':
	print('How are you doing?')
elif name == 'Anna':
	print('Hello, Anna')
else:
	print('Hi!')
These two programs do exactly the same. They print personalized greeting messages and contain many if/else statements. Yet, the first one has many layers of nested if/else blocks, while the second uses elif statements which stands for else if.

Challenge

Having a grade which is a number from 0 to 100, we would like to know what would that grade correspond to in the US Letter grading system (A, B, C, D, and F).
Note: Do not use only if statements with range checks. Use elif when checking for another condition.
Numeric grade
Letter grade
90-100
A
80-89
B
70-79
C
60-69
D
0-59
F
Write a program that would do the conversion.
Input
Output
81
B
100
A
 
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