<p>A word is considered <strong>valid</strong> if:</p>

<ul>
	<li>It contains a <strong>minimum</strong> of 3 characters.</li>
	<li>It contains only digits (0-9), and English letters (uppercase and lowercase).</li>
	<li>It includes <strong>at least</strong> one <strong>vowel</strong>.</li>
	<li>It includes <strong>at least</strong> one <strong>consonant</strong>.</li>
</ul>

<p>You are given a string <code>word</code>.</p>

<p>Return <code>true</code> if <code>word</code> is valid, otherwise, return <code>false</code>.</p>

<p><strong>Notes:</strong></p>

<ul>
	<li><code>&#39;a&#39;</code>, <code>&#39;e&#39;</code>, <code>&#39;i&#39;</code>, <code>&#39;o&#39;</code>, <code>&#39;u&#39;</code>, and their uppercases are <strong>vowels</strong>.</li>
	<li>A <strong>consonant</strong> is an English letter that is not a vowel.</li>
</ul>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">word = &quot;234Adas&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">true</span></p>

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

<p>This word satisfies the conditions.</p>
</div>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">word = &quot;b3&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">false</span></p>

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

<p>The length of this word is fewer than 3, and does not have a vowel.</p>
</div>

<p><strong class="example">Example 3:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">word = &quot;a3$e&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">false</span></p>

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

<p>This word contains a <code>&#39;$&#39;</code> character and does not have a consonant.</p>
</div>

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

<ul>
	<li><code>1 &lt;= word.length &lt;= 20</code></li>
	<li><code>word</code> consists of English uppercase and lowercase letters, digits, <code>&#39;@&#39;</code>, <code>&#39;#&#39;</code>, and <code>&#39;$&#39;</code>.</li>
</ul>

class Solution:
    def isValid(self, word: str) -> bool:
        vowels = {'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'}
        has_vowel = False
        has_consonant = False
        
        if len(word) < 3:
            return False
        
        for char in word:
            if char.isalpha():
                if char in vowels:
                    has_vowel = True
                else:
                    has_consonant = True
            elif char.isdigit():
                continue
            else:
                return False  # Special character found
        
        return has_vowel and has_consonant
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