input: def sum_list(input_list: list) -> int:
      """
      Takes a list of integers as input and returns the sum of the items in the list.
      
      >>> sum_list([1, 2, 3, 4])
      10
      >>> sum_list([5, 5, 5])
      15
      >>> sum_list([0, -1, 1])
      0
      """
output:     return sum(input_list)