<prompt> Translate the following text to SwahiliThe Postal Service has two basic subclasses for letters and First Class originally rapid, non-bulk, and sealed against inspection and Standard A originally deferrable, bulk, and not sealed against inspection.  <response>: Ujumbe wa barua una aina mbili za barua: kwanza, ambayo ni ya haraka, isiyo ya wingi, na iliyofungwa ili kuzuia ukaguzi, na ya kawaida, ambayo ni ya muda mrefu, isiyo ya wingi, na isiyofungwa ili kuzuia ukaguzi. 