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+<h2>1684. Count the Number of Consistent Strings</h2><h3>Easy</h3><hr><div><p>You are given a string <code>allowed</code> consisting of <strong>distinct</strong> characters and an array of strings <code>words</code>. A string is <strong>consistent </strong>if all characters in the string appear in the string <code>allowed</code>.</p>
+
+<p>Return<em> the number of <strong>consistent</strong> strings in the array </em><code>words</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> allowed = "ab", words = ["ad","bd","aaab","baa","badab"]
+<strong>Output:</strong> 2
+<strong>Explanation:</strong> Strings "aaab" and "baa" are consistent since they only contain characters 'a' and 'b'.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> allowed = "abc", words = ["a","b","c","ab","ac","bc","abc"]
+<strong>Output:</strong> 7
+<strong>Explanation:</strong> All strings are consistent.
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> allowed = "cad", words = ["cc","acd","b","ba","bac","bad","ac","d"]
+<strong>Output:</strong> 4
+<strong>Explanation:</strong> Strings "cc", "acd", "ac", and "d" are consistent.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= words.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>1 &lt;= allowed.length &lt;=<sup> </sup>26</code></li>
+	<li><code>1 &lt;= words[i].length &lt;= 10</code></li>
+	<li>The characters in <code>allowed</code> are <strong>distinct</strong>.</li>
+	<li><code>words[i]</code> and <code>allowed</code> contain only lowercase English letters.</li>
+</ul>
+</div>