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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)

test = "hello"

print(test)

print(reverse_vowel(test))