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< p > Given a string < code > s< / code > , reverse only all the vowels in the string and return it.< / p >
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< p > The vowels are < code > ' a' < / code > , < code > ' e' < / code > , < code > ' i' < / code > , < code > ' o' < / code > , and < code > ' u' < / code > , and they can appear in both lower and upper cases, more than once.< / p >
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< p > < / p >
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< p > < strong class = "example" > Example 1:< / strong > < / p >
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< pre > < strong > Input:< / strong > s = "hello"
< strong > Output:< / strong > "holle"
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< / pre > < p > < strong class = "example" > Example 2:< / strong > < / p >
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< pre > < strong > Input:< / strong > s = "leetcode"
< strong > Output:< / strong > "leotcede"
< / pre >
< p > < / p >
< p > < strong > Constraints:< / strong > < / p >
< ul >
< li > < code > 1 < = s.length < = 3 * 10< sup > 5< / sup > < / code > < / li >
< li > < code > s< / code > consist of < strong > printable ASCII< / strong > characters.< / li >
< / ul >
