input: 
  def calculate_sum_of_sequence(sequence: List[int]) -> int:
      """ Calculate the sum of a sequence of integers.
      >>> calculate_sum_of_sequence([1, 2, 3, 4, 5])
      15
      >>> calculate_sum_of_sequence([-1, 0, 1])
      0
      """
  
output:     return sum(sequence)