Sorting and replacing content

Hi,

I have this structure where the content of tags <A> to <E> have to determine
the order of tag-content <a> to <e>. The result needs to be as shown below.

I can manage to make a stylesheet with an <xsl:if> for each <A> to <E>
asking whether the number is 1, 2, 3, 4 or 5, but I am sure there must be a
simpler way to do this. I can not use position() since the position af the
tags can change in the structure.

<Root>
<a>10</a>
<b>20</b>
<c>30</c>
<d>40</d>
<e>50</e>
...

...
<A>3</A>
<B>5</B>
<C>1</C>
<D>2</D>
<E>4</E>
</Root>

Result I need:

<no>30</no> <!-- C = 1 has to be first with the value of c (which is 30) -->
<no>40</no>
<no>10</no>
<no>50</no>
<no>30</no>


Thanks.
Kenny Bogoe