input: Write a function to sort two strings and return them as tuples of characters.
  assert sort_strings("apple", "banana") == (['a', 'e', 'l', 'p', 'p'], ['a', 'a', 'a', 'b', 'n', 'n'])
  assert sort_strings("hello", "world") == (['e', 'h', 'l', 'l', 'o'], ['d', 'l', 'o', 'r', 'w'])
  assert sort_strings("python", "java") == (['h', 'n', 'o', 'p', 't', 'y'], ['a', 'a', 'j', 'v'])
output: def sort_strings(str1, str2):
      return (sorted(str1), sorted(str2))