Tricky problem, limiting the number of source elements proce

I am having difficulties figuring out how to do this, so any help is greatly
appreciated. 

Lets say you have two types of elements, "typeA" and "typeB" that you want
to display, but you only want to display a maximum number of them, say five.
More particularly, you want to display as many of typeA as possible, up to
the limit of five, but if there are less than five typeAs, the remaining
space should be filled with typeBs.

So if you have say:
<typeA>A1</typeA>
<typeA>A2</typeA>
<typeA>A3</typeA>
<typeA>A4</typeA>
<typeB>B1</typeB>
<typeB>B2</typeB>
<typeB>B3</typeB>

, that is 4 typeAs and 3 typeBs, you would get: 

A1, A2, A3, A4, B1.

as there is one space remaining for a typeB element.

Thanks.




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