<p>Given a string <code>s</code>, reverse only all the vowels in the string and return it.</p>

<p>The vowels are <code>&#39;a&#39;</code>, <code>&#39;e&#39;</code>, <code>&#39;i&#39;</code>, <code>&#39;o&#39;</code>, and <code>&#39;u&#39;</code>, and they can appear in both lower and upper cases, more than once.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;IceCreAm&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">&quot;AceCreIm&quot;</span></p>

<p><strong>Explanation:</strong></p>

<p>The vowels in <code>s</code> are <code>[&#39;I&#39;, &#39;e&#39;, &#39;e&#39;, &#39;A&#39;]</code>. On reversing the vowels, s becomes <code>&quot;AceCreIm&quot;</code>.</p>
</div>

<p><strong class="example">Example 2:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;leetcode&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">&quot;leotcede&quot;</span></p>
</div>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= s.length &lt;= 3 * 10<sup>5</sup></code></li>
	<li><code>s</code> consist of <strong>printable ASCII</strong> characters.</li>
</ul>

class Solution:
    def reverseVowels(self, s: str) -> str:
        start_index = 0
        end_index = len(s)-1
        str_list = list(s)
        
        vowels = ['a', 'e', 'i', 'o', 'u', 'A','E','I', 'O', 'U']

        while start_index < end_index:
            while start_index < end_index and s[start_index] not in vowels:
                start_index+=1
            while start_index < end_index and s[end_index] not in vowels:
                end_index-=1
            
            if start_index < end_index:
                st = s[start_index]
                en = s[end_index]

                str_list[start_index] = en
                str_list[end_index] = st

                start_index+=1
                end_index-=1

        return ''.join(str_list)
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