input: Write a function to find the total surface area of a cuboid, given its three dimensions. The function should return the calculated surface area. If any dimension is missing then the function should return -1.
  
  assert find_total_surfacearea(2, 3, 4)==52
  assert find_total_surfacearea(1, 1, 1)==6
  assert find_total_surfacearea(3, 3, 3)==54
  assert find_total_surfacearea(6, 2, 4)==88
  assert find_total_surfacearea(2, 4)==-1
output: def find_total_surfacearea(l, w, h=None):
      if h is None:
          return -1
      return 2 * (l * w + w * h + h * l)