_INPUT FILE_
<book>
<a>A
<b>B
<c>C</c>
<e>E</e>
<e>V</e>
</b>
<d>D</d>
</a>
</book>
_OUTPUT FILE_
<?xml version='1.0'?>
<opt></opt>
_EXPECTED OUTPUT_FILE
<?xml version='1.0'?>
<1>A
<2>B
<3>C</3>
<5>E</5>
<5>V</5>
</b>
<4>D</4>
</1>