input: Write a function to find the longest strings in a list.
  assert get_longest_strings(['cat', 'kitten', 'puppy']) == ['kitten']
  assert get_longest_strings(['apple', 'banana', 'pear', 'peach', 'plum']) == ['banana']
  assert get_longest_strings(['a', 'bb', 'ccc', 'dddd', 'ee', 'f']) == ['dddd']
output: def get_longest_strings(strings):
      max_length = max(len(s) for s in strings)
      return [s for s in strings if len(s) == max_length]