Need XSL code to achieve this

Input XML:

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="trans.xsl"?>
<rootecf>
<XBRL>
<Name>Akhil</Name>
</XBRL>
<PI20>
<Address>Villa</Address>
</PI20>
</rootecf>

Output XML:

<?xml version="1.0"?>
<rootecf>
<XBRL>
<Name>Akhil</Name>
<PI20Addres>Villa</PI20Addres>
</XBRL>

What I am trying to do here is that in the output XML i am creating a new tag called <PI20Addres> with the value of the PI20/Address tag. The important point here is that I do not want the XBRL tag to be hardoced in the output XML as i have hardcoded PI20Adress tag, but instead it should be read from the input XML and coped as it is.

The reason i am saying is that the XBRL tag will be having namespaces that will change randomly in the incoming XML, so I have to copy the tag rather than hardcoding it.

Can anyone please tell me how can I achieve this with XSL?