????????
      ----------
UWHYP ) PFRUGTQR
       -HUNJX
        =====
        UJLGPT
       -UPRJUX
        ======
          RYHUQ
         -LJMTX
          =====
           GFQGR
          -FPWQN
           =====
           ?????

base: 15
symbols: FGHJLMNPQRTUWXY
difficulty: hard