docs: def start(st_reg_number):
      """Checks the number valiaty for the Alagoas state"""
  
      if len(st_reg_number) > 9:
          return False
  
      if len(st_reg_number) < 9:
          return False
  
      if st_reg_number[0:2] != "24":
          return False
  
      if st_reg_number[2] not in ['0', '3', '5', '7', '8']:
          return False
  
      aux = 9
      sum_total = 0
      for i in range(len(st_reg_number)-1):
          sum_total = sum_total + int(st_reg_number[i]) * aux
          aux -= 1
  
      product = sum_total * 10
  
      aux_2 = int(product/11)
  
      digit = product - aux_2 * 11
  
      if digit == 10:
          digit = 0
  
      return digit == int(st_reg_number[len(st_reg_number)-1])