input: 
  from typing import List
  
  
  def find_total_surface_area(dimensions: List[int]) -> int:
      """Given three dimensions of a cuboid, calculate its total surface area.
      The dimensions are provided as a list of three integers.
  
      >>> find_total_surface_area([2, 3, 4])
      52
      """
  
output:     l, w, h = dimensions
      return 2 * (l * w + w * h + h * l)