????????
      ----------
RXXPC ) QWNWPNXM
       -NRPXM
        =====
        RRLTLN
       -RPMQUW
        ======
          MXYXX
         -YYQNQ
          =====
           MPUUM
          -YYQNQ
           =====
           ?????

base: 12
symbols: CLMNPQRTUWXY
difficulty: medium