input: Write a function to read in 15 integers and return the sum of them. If the list contains more or fewer than 15 integers, return False.
  
  def sum_15_nums(nums):
      if len(nums) != 15:
          return False
      total = 0
      for num in nums:
          total += num
      return total
  
  assert sum_15_nums([1, 5, 9, 0, 2, 4, 7, 8, 6, 10, 3, 11, 12, 13, 14]) == 95
  assert sum_15_nums([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]) == 120
  assert sum_15_nums([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]) == False
  assert sum_15_nums([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]) == False
output: def sum_15_nums(nums):
      if len(nums) != 15:
          return False
      total = 0
      for num in nums:
          total += num
      return total