INPUT:
<h1>
abc
<h2>
abc
<h3>
abc
<h3>
abc
<h2>
abc


OUTPUT:

<sec id="1">
<p>abc</p>
<sec id="2">
<p>abc</p>
<sec id="3">
<p>abc</p>
</sec>
<sec id="3">
<p>abc</p>
</sec>
</sec>
<sec id="2">
<p>abc</p>
</sec>
</sec>