????????
      ----------
LXUYU ) XNQPQLNU
       -XLXGU
        =====
         PUTRL
        -LXUYU
         =====
          CWCGN
         -GPUPW
          =====
           CXRNU
          -GPUPW
           =====
           ?????

base: 12
symbols: CGLNPQRTUWXY
difficulty: hard