input: def validate_triangle_and_compute_area(a, b, c):
      '''
      Takes the lengths of three sides of a triangle as input. 
      Returns the area of the triangle rounded to 2 decimal places if the sides create a valid triangle. 
      If not, returns -1.
      A valid triangle is formed when the sum of any two sides exceeds the length of the third side.
      Example:
      validate_triangle_and_compute_area(3, 4, 5) == 6.00
      validate_triangle_and_compute_area(1, 2, 10) == -1
      '''
output:     
      s1 = a + b > c
      s2 = b + c > a
      s3 = c + a > b
  
      if not (s1 and s2 and s3):
          return -1
  
      s = (a + b + c) / 2
      area = (s * (s - a) * (s - b) * (s - c)) ** 0.5
      return round(area, 2)
  