input: def fetch_nearest_vowel(text):
      """Given a text string, your task is to identify the closest vowel that is flanked 
      by two consonants from the right side of the string (case sensitive).
      
      Vowels at the beginning and end of the string are not counted. Return an empty string 
      if no vowel meeting the above condition is found.
  
      You can assume the input string consists of English letters only.
  
      Example:
      fetch_nearest_vowel("yogurt") ==> "u"
      fetch_nearest_vowel("FULL") ==> "U"
      fetch_nearest_vowel("quick") ==> ""
      fetch_nearest_vowel("ab") ==> ""
      """
output:     
      vowels = "aeiouAEIOU"
      length = len(text)
      for i in range(length - 2, 0, -1):
          if text[i] in vowels and text[i - 1] not in vowels and text[i + 1] not in vowels:
              return text[i]
      return ""
  