copying problem

Hello,

I have the following problem, I have a xml document like this
<root>
 <A>..</A>
 <B>..</B>
 <A>..</A>
 <B>..</B>
 <B>..</B>
 <A>..</A>
 <B>..</B>
 <B>..</B>
 <B>..</B>
 <B>..</B>
 <A>..</A>
</root>

In wich i want to delete the last A element and all the B elements between 
the last and forlast A element. The number of B elements between the A 
elements is variable, as is the number of A elements (but between each A 
element there are a number of B elements)
so i need to get an output xml like this:

<root>
 <A>..</A>
 <B>..</B>
 <A>..</A>
 <B>..</B>
 <B>..</B>
 <A>..</A>
</root>

who can help this xslt newbie?
greetings

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