Attack with known hints (position unknown) + brutforce for other chars

[kazax]

You could build a mask file.
If you expect digits or lowercase on the unknown locations, you could do something like:
?l?d, jupiter?1?1?1?1?1#
?l?d, jupiter?1?1?1?1#?1
?l?d, jupiter?1?1?1#?1?1
......
?l?d, #?1?1?1jupiter?1?1
......
?l?d, ?1?1?1?1?1#jupiter

yes indeed I think that a mask file remains the simplest approach, I continued to browse the wiki and forum and this is the idea that comes out on similar cases.
I will make a small script to generate all masks covering all cases.

thank you for confirmation