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<p>Given a string <code>s</code>, return <em>the number of <strong>homogenous</strong> substrings of </em><code>s</code><em>.</em> Since the answer may be too large, return it <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>.</p>
<p>A string is <strong>homogenous</strong> if all the characters of the string are the same.</p>
<p>A <strong>substring</strong> is a contiguous sequence of characters within a string.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;abbcccaa&quot;
<strong>Output:</strong> 13
<strong>Explanation:</strong> The homogenous substrings are listed as below:
&quot;a&quot; appears 3 times.
&quot;aa&quot; appears 1 time.
&quot;b&quot; appears 2 times.
&quot;bb&quot; appears 1 time.
&quot;c&quot; appears 3 times.
&quot;cc&quot; appears 2 times.
&quot;ccc&quot; appears 1 time.
3 + 1 + 2 + 1 + 3 + 2 + 1 = 13.</pre>