'''
BMI can be calulated as: 
BMI = weight / height^2

Exercise A: Calculate the BMI of various people using a `for` loop and return
BMIs as a list.
'''

weights = [60, 76, 55, 90]
heights = [1.70, 1.80, 1.65, 1.90]

bmi = []

# Your code here
    
print(bmi)


'''
Exercise B: Imagine later we want to calculate the BMI of another list of people. 
we could copy the code, but if we want to do this more often it is better to 
write a function and avoid code duplication. 

Rewrite the code into a function called `calculate_bmi`, then call the function
and save the output in variable `bmi`. Finally, print the results.
'''

weights = [60, 76, 55, 90]
heights = [1.70, 1.80, 1.65, 1.90]

def calculate_bmi( # Your code here):
    # Your code here
    return # Your code here

bmi = calculate_bmi( # Your code here)

print(bmi)