FYCH
      ----------
 HCHH ) FYQTXNYX
       -NHWHY
        =====
         YCTFN
        -WHNHF
         =====
          CCFHY
         -YHTHN
          =====
           HNXQX
          -CHXHT
           =====
            NHQH

base: 10
symbols: CEFHNQTWXY
difficulty: intermediate
missing: E