input: from typing import List, Optional
  
  def vowelCheck(inputString: str) -> Optional[str]:
      """ Given a string, check if it contains any vowels and return the first vowel found.
      If no vowels are found, return None.
      >>> vowelCheck("Hello World")
      'e'
      >>> vowelCheck("Brrr")
      None
      """
      vowels = ['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U']
      for x in inputString:
          if x in vowels:
              return x
      return None
output:     vowels = ['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U']
      for x in inputString:
          if x in vowels:
              return x
      return None