input: from typing import List
  
  def vowelCheck(inputString: str) -> str:
      """ Takes an input string, and detects the first vowel in it. 
      Vowels are defined as 'a', 'e', 'i', 'o', 'u'. 
      
      >>> vowelCheck('Hello World')
      'e'
      """
output:     vowels = 'aeiou'
      for char in inputString:
          if char.lower() in vowels:
              return char