input: def sortDictionary(dictionary: dict) -> dict:
      """ Sort the given dictionary by its values in descending order.
      >>> sortDictionary({'apple': 2, 'banana': 3, 'mango': 1})
      {'banana': 3, 'apple': 2, 'mango': 1}
      """
output:     return {k: v for k, v in sorted(dictionary.items(), key=lambda item: item[1], reverse=True)}