input: from typing import List
  
  def list_all_countries(countries: List[str]) -> List[str]:
      """ Given a list of countries, return the list of all countries.
      >>> list_all_countries(["USA", "Canada", "Mexico"])
      ["USA", "Canada", "Mexico"]
      >>> list_all_countries(["Germany", "France", "UK"])
      ["Germany", "France", "UK"]
      """
output:     return countries