input: from typing import List
  
  def sort_strings_by_length(word_list: List[str]) -> List[str]:
      """
      Sort a list of strings based on their length.
  
      >>> sort_strings_by_length(["Hello", "World!", "Good", "Morning"])
      ['Good', 'Hello', 'Morning', 'World!']
      """
      word_list.sort(key=len)
      return word_list
output:     word_list.sort(key=len)
      return word_list