input:     
  def filter_vowels(string: str) -> str:
      """ Filter out all the vowels from a given string and return the remaining characters.
      >>> filter_vowels('hello world')
      'hll wrld'
      >>> filter_vowels('pythonic')
      'pythnc'
      """
       vowels = ('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U')
       return ''.join(c for c in string if c not in vowels)
output:     vowels = ('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U')
      return ''.join(c for c in string if c not in vowels)