????????
      +---------
9BC52 | A47B3206
       -9BC52
        =====
         C61C2
        -0C03B
         =====
          208B0
         -D0AAC
          =====
          919D76
         - 736B1
          ======
          ??????

base: 14
letters: 0123456789ABCD
difficulty: medium