input: from typing import List
  
  def insertion_sort(list: List[int]) -> List[int]:
      """ Sorts a list of integers using the insertion sort algorithm.
      >>> insertion_sort([3, 1, 2])
      [1, 2, 3]
      >>> insertion_sort([4, 2, 7, 1, 3])
      [1, 2, 3, 4, 7]
      """
output:     for i in range(1, len(list)):
          key = list[i]
          j = i - 1
          while j >= 0 and key < list[j]:
              list[j + 1] = list[j]
              j -= 1
          list[j + 1] = key
      return list