def METHOD_NAME(self, id_cipher, replace_val=True):
    if replace_val:
        id_cipher = id_cipher.mapValues(lambda v: None)
    self.transfer_variable.id_ciphertext_list_exchange_h2g.remote(id_cipher,
                                                                  role=consts.GUEST,
                                                                  idx=0)
    LOGGER.info("sent id 1st ciphertext to guest")
    id_guest = self.transfer_variable.id_ciphertext_list_exchange_g2h.get(idx=0)
    LOGGER.info("got id 1st ciphertext from guest")
    return id_guest