input: Write a function to find the total surface area of a cuboid given its three dimensions. The function should return the total surface area. If any of the dimensions are invalid (i.e., not positive integers), it should return -1.
  assert find_total_surfacearea(2, 3, 4)==52
  assert find_total_surfacearea(1, 1, 1)==6
  assert find_total_surfacearea(0, 3, 4)==-1
  assert find_total_surfacearea(2, -1, 4)==-1
  assert find_total_surfacearea(2, 3, 0)==-1
output: def find_total_surfacearea(l, w, h):
      if l <= 0 or w <= 0 or h <= 0:
          return -1
      return 2 * (l * w + w * h + h * l)