input: 
  def dot_product(list1: List[int], list2: List[int]) -> int:
      """ Calculate the dot product of two given lists of integers.
      >>> dot_product([1, 2], [3, 4])
      11
      >>> dot_product([5, 6], [7, 8])
      83
      """
      product = 0
      for i in range(len(list1)):
          product += (list1[i] * list2[i])
      return product
  
output:     product = 0
      for i in range(len(list1)):
          product += (list1[i] * list2[i])
      return product