VBA problem - reverse an alphanumeric string, but reverse only letters and leave digits wh

Hi everyone,

I have a VBA code puzzle to solve.

I want to reverse an alphanumeric string, but reverse only letters and leave digits where they are.

So for example:
abc123dfg ---> gfd123cba
451ubno98p ---> 451ponb98u
egc88rtv972nq100 ---> qnv88trc972ge100

Do you have any ideas?
Probably I must use nested loop. I came with this idea, but it's not working perfectly:

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UDF

Use in cell like

=ReverseAlpha(A1)

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Thank you! It's working fine

I wonder if the same can be done using only nested loops in VBA.

Thank you!