input: from typing import List
  
  def unionList(list1: List[int], list2: List[int]) -> List[int]:
      """ Find the union of two given lists.
      >>> unionList([1, 2, 3, 4, 5], [3, 4, 5, 6, 7])
      [1, 2, 3, 4, 5, 6, 7]
      >>> unionList([10, 20, 30], [40, 50])
      [10, 20, 30, 40, 50]
      """
output:     set1 = set(list1)
      set2 = set(list2)
      union_set = set1.union(set2)
      return sorted(list(union_set))