????????
      ----------
FXYCR ) UWCRJCUX
       -FXYCR
        =====
        JFJQTC
       -JWRWXY
        ======
         JCWRJU
        - FXYCR
         ======
          WFYFYX
         -WCFTCJ
          ======
          ??????

base: 11
symbols: CFJPQRTUWXY
missing: P
difficulty: medium