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