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