class="lineno">   12</span>        {</div>
<div class="line"><span class="lineno">   13</span>            <span class="keywordtype">char</span>[] numbers = (from c in s</div>
<div class="line"><span class="lineno">   14</span>                              where <span class="keywordtype">char</span>.IsLetterOrDigit(c)</div>
<div class="line"><span class="lineno">   15</span>                              select c).ToArray();</div>
<div class="line"><span class="lineno">   16</span>            <span class="key