input: from typing import List
  
  def sum_ints(nums: List[int]) -> int:
      """ Sum 15 integers and return the result.
      >>> sum_ints([1, 5, 9, 0, 2, 4, 7, 8, 6, 10, 3, 11, 12, 13, 14])
      105
      """
      total = 0
      for num in nums:
          total += num
      return total
output:     if len(nums) != 15:
          raise ValueError("The list must contain exactly 15 integers.")
      return total