def missing_numbers(num_list):  
      original_list = [x for x in range(num_list[0], num_list[-1] + 1)]  
      num_list = set(num_list)  
      return (list(num_list ^ set(original_list)))  
  
print(missing_numbers([1,2,3,4,6,7,10]))  
print(missing_numbers([10,11,12,14,17])) 