input: def find_nearest_vowel(word):
      """Given a word, the goal is to identify the nearest vowel that is positioned 
      between two consonants from the right side of the string, maintaining case sensitivity.
      
      Vowels at the beginning and end are not considered. Return an empty string if no vowel 
      meets this condition.
      
      Assume the input string contains only English letters.
      
      Example:
      find_nearest_vowel("yogurt") ==> "u"
      find_nearest_vowel("FULL") ==> "U"
      find_nearest_vowel("quick") ==> ""
      find_nearest_vowel("ab") ==> ""
      """
output:     
      vowels = "aeiouAEIOU"
      length = len(word)
  
      for i in range(length - 2, 0, -1):
          if word[i] in vowels and word[i - 1] not in vowels and word[i + 1] not in vowels:
              return word[i]
      return ""
  