def hi_ha_feble(lcont):
    for parella in lcont:
        ll = parella.split(':')
        servei, cont = ll
        if len(cont)<6 or cont.isalpha():
            return cont
    return ''

def filtra_usuaris_dep(llista,ldep):
    ll = []
    for persona in llista:
        nom, lcont = persona
        feble = hi_ha_feble(lcont)
        if nom in ldep and len(feble)!=0:
            t = (nom, feble)
            ll.append(t)
    ll.sort(reverse=True)
    return ll