Look At Column A Number In Descending Sequence In Column B

there may even be an excel formula answer to it rather than a macro. Coloumn A has a series of numbers, I want column B to show those numbers in what would be there Descending Sequence.

Thus
Col A
100
97
14
87
32
108
21

So with this routine you would then see

COL ACOL B10029731478743251081216 The above I suspect is not too difficult, however if two (or more) numbers are the same I want the sequence to reflect that thus COL A COL B100297 314 797 332 5108 121 6 and no... the data - Col A - cannot be sorted, it must stay in that sequence.

If possible I would want this done automatically when any Col A value changes (any unused cells would be 0 by the way). Oh, there will in fact be 25 cells in column A for this.