Cant get grade part of code to work correctly

[Expel]

trying to get the grade part of the code to work, the rest seems to work fine

print("enter 5#s")
num1 = int(input())
num2 = int(input())
num3 = int(input())
num4 = int(input())
num5 = int(input())
numbers = [num1, num2, num3, num4, num5]
numsum = sum(numbers)
print("sum is:", numsum)
#Above list is working
def Average(numbers):
    return sum(numbers) / len (numbers)
print("AVG = ", round(Average(numbers), 2))
#determine letter grade below
score = int(Average(numbers)
if score >= 90:
  print('Grade is = A')
elif score >= 80:
  print('Grade is = B')    
elif score >= 70:
  print('Grade is = C')
elif score >= 60:
  print('Grade is = D')
else:
  print('Grade is = F')