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+<h2>1323. Maximum 69 Number</h2><h3>Easy</h3><hr><div><p>Given a positive integer <code>num</code> consisting only of digits 6 and 9.</p>
+
+<p>Return the maximum number you can get by changing <strong>at most</strong> one digit (6 becomes 9, and 9 becomes 6).</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> num = 9669
+<strong>Output:</strong> 9969
+<strong>Explanation:</strong> 
+Changing the first digit results in 6669.
+Changing the second digit results in 9969.
+Changing the third digit results in 9699.
+Changing the fourth digit results in 9666.&nbsp;
+The maximum number is 9969.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> num = 9996
+<strong>Output:</strong> 9999
+<strong>Explanation:</strong> Changing the last digit 6 to 9 results in the maximum number.</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> num = 9999
+<strong>Output:</strong> 9999
+<strong>Explanation:</strong> It is better not to apply any change.</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= num &lt;= 10^4</code></li>
+	<li><code>num</code>'s digits are 6 or 9.</li>
+</ul></div>