input: 
  def vowelCheck(inputString: str) -> str:
      """ Detect and return the first vowel found in the given string.
      >>> vowelCheck('Hello World')
      'e'
      >>> vowelCheck('Sky')
      """
      vowels = ['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U']
      for x in inputString:
          if x in vowels:
              return x
  
output:     return ''