QCHF
      ----------
 FHFF ) QCXEAWCA
       -WFUFC
        =====
         CHEQW
        -UFWFQ
         =====
          HHQFC
         -CFEFW
          =====
           FWAXA
          -HFAFE
           =====
            WFXF

base: 10
symbols: ACEFHNQUWX
difficulty: intermediate
missing: N