????????
      ----------
WQGJX ) VRMYZLZM
       -WQGJX
        =====
        YVNQWL
       -YYUHXJ
        ======
         XTPYVZ
        -XUZJHU
         ======
          WXUVHM
         -WNMNMG
          ======
          ??????

base: 16
symbols: GHJLMNPQRTUVWXYZ
difficulty: medium