How to separate symbols and numbers from a list and rebuilt this list in the right order after some process ?

Hello, here's a new game with lists.
How to separate symbols and numbers from a list and rebuilt this list in the right order after some process ?

Becomes:
[A Symbol] & [1 2 12] for processing

sort-and-rebuilt-list-of-numbers-and-symbols

I got theway to separate symbols & numbers but I can't figure out how to rebuilt the lists...

Is the input always in the same format? Does it change after processing? If it doesn't change you could use [unpack A Symbol] and [unpack 1 2 12] into a [pack A 1 2 Symbol 12]

@Rick : no it will be to easy. You never know how will be the lists (format and contents/values) and how long it will be. It can change for each.

sort and rebuilt list of numbers and symbols