count-the-number-of-special-characters-i

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Algorithms

You are given a string <code>word</code>. A letter is called special if it appears both in lowercase and uppercase in <code>word</code>.

Return the number of special letters in <code>word</code>.

&nbsp;
Example 1:

<div class="example-block">
Input: word = &quot;aaAbcBC&quot;

Output: 3

Explanation:

The special characters in <code>word</code> are <code>&#39;a&#39;</code>, <code>&#39;b&#39;</code>, and <code>&#39;c&#39;</code>.
</div>

Example 2:

<div class="example-block">
Input: word = &quot;abc&quot;

Output: 0

Explanation:

No character in <code>word</code> appears in uppercase.
</div>

Example 3:

<div class="example-block">
Input: word = &quot;abBCab&quot;

Output: 1

Explanation:

The only special character in <code>word</code> is <code>&#39;b&#39;</code>.
</div>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= word.length &lt;= 50</code></li>
	<li><code>word</code> consists of only lowercase and uppercase English letters.</li>
</ul>