code: def reverse_vowel(s):
      vowels = "AEIOUaeiou"
      i, j = 0, len(s) - 1
      s = list(s)
      while i < j:
          while i < j and s[i] not in vowels:
              i += 1
          while i < j and s[j] not in vowels:
              j -= 1
          s[i], s[j] = s[j], s[i]
          i, j = i + 1, j - 1
      return "".join(s)
  
label_desc: Use image node_id 1 for calling a global function with example usage: reverse_vowel(s) and returns: str