input: 
  from typing import List
  
  
  def sort_by_length(words: List[str]) -> List[str]:
      """ Sorts a list of strings by their length in ascending order.
      >>> sort_by_length(["Hello","World!","Good","Morning"])
      ['Good', 'Hello', 'World!', 'Morning']
      """
  
output:     return sorted(words, key=len)