input: def vowelCheck(inputString):
      """
      Detect the first vowel in a given string.
      >>> vowelCheck('Hello World')
      'e'
      >>> vowelCheck('Python Programming')
      'o'
      """
output:     vowels = "aeiouAEIOU"
      for char in inputString:
          if char in vowels:
              return char
      return None