input: 
  def vowelCheck(inputString: str) -> str:
      """Check and return the first vowel found in a given input string. 
      If no vowel is found, the function will implicitly return None.
      
      >>> vowelCheck('Hello World')
      'e'
      >>> vowelCheck('Python Programming')
      'o'
      """
      vowels = ['a','e','i','o','u','A','E','I','O','U'] 
      for x in inputString:
          if x in vowels:
              return x
  
output:     vowels = ['a','e','i','o','u','A','E','I','O','U'] 
      for x in inputString:
          if x in vowels:
              return x