>>> from cool_modul import cooleja

>>> cooleja('mango lakaixa amazon')
'..m4ng0......l4k41x4.......4m4z0n...'

>>> cooleja('ouigo parlem bonpreu')
'....061g0......p4rl3m.....b0npr36...'

>>> cooleja('axa eau dzn')
'..4x4.....346...dzn'