????????
      ----------
NUUGF ) UYWTYWXX
       -NUUGF
        =====
        TEYGFW
       -TRFNTY
        ======
         TNYEUX
        -TRFNTY
         ======
          WNXFEX
         -WGNYWT
          ======
          ??????

base: 10
symbols: EFGNRTUWXY
difficulty: hard