????????
      ----------
FYHFU ) XXAYHFJX
       -JMXNN
        =====
        YFUYHF
       -YNJMFU
        ======
         YMUAHJ
        -YUFNHU
         ======
          YWANWX
         -YWNWUN
          ======
          ??????

base: 10
symbols: AFHJMNUWXY
difficulty: hard