????????
      +---------
QQQYN | UCNAYLLC
       -QQQYN
        =====
        CLYYAL
       -CAAFCM
        ======
         CCFULL
        -CMMCXA
         ======
          CFXQCC
         -CAAFCM
          ======
          ??????

base: 10
letters: ACFLMNQUXY
difficulty: hard