>>> from valora_modul import valora

--ini
>>> valora('**2-a3.24/b5c')
1
>>> valora('32**-a3.24/b5c')
1
>>> valora('**32-a3.24/b5c0000')
9
>>> valora('2-a./bc**')
0
>>> valora('**-a./bc')
-1
>>> valora('*0*-a0./bc00')
0

--fi