<p>In these strings like <code>"heeellooo"</code>, we have groups of adjacent letters that are all the same: <code>"h"</code>, <code>"eee"</code>, <code>"ll"</code>, <code>"ooo"</code>.</p>
<p>You are given a string <code>s</code> and an array of query strings <code>words</code>. A query word is <strong>stretchy</strong> if it can be made to be equal to <code>s</code> by any number of applications of the following extension operation: choose a group consisting of characters <code>c</code>, and add some number of characters <code>c</code> to the group so that the size of the group is <strong>three or more</strong>.</p>
<ul>
<li>For example, starting with <code>"hello"</code>, we could do an extension on the group <code>"o"</code> to get <code>"hellooo"</code>, but we cannot get <code>"helloo"</code> since the group <code>"oo"</code> has a size less than three. Also, we could do another extension like <code>"ll" ->"lllll"</code> to get <code>"helllllooo"</code>. If <code>s = "helllllooo"</code>, then the query word <code>"hello"</code> would be <strong>stretchy</strong> because of these two extension operations: <code>query = "hello" ->"hellooo" ->"helllllooo" = s</code>.</li>
</ul>
<p>Return <em>the number of query strings that are <strong>stretchy</strong></em>.</p>
