Hints for the calculator problem (in Caesar cipher, so you can read one hint at a time)

(1) eqbp kmzbiqv kitkctibwza,  gwc uig vmml bw cam i bpqzl smg: bpm mycita aqov
(2) lxiw hdbt ktgn rwtpe rparjapidgh, iwxh igxrz bpn cdi ldgz pi paa
(3) uhma ateoxl hy max ikhuexf nlx max ltfx mph dxrl
(4) jxu iusedt iebkjyed yi jxu iqcu qi jxu vyhij myjx edu vumuh auoijheau

Solution