????????
      ----------
RRYQM ) UUFYWPTQ
       -XURPW
        =====
        TNXXNP
       - QNNFT
        ======
         TXMWFT
        -TMUWUY
         ======
           PNTFQ
          -HFUFH
           =====
           ?????

base: 12
symbols: FHMNPQRTUWXY
difficulty: medium