CB14
      +---------
D9AF3 | 8CE5D38A
       -1E4C5
        =====
        232D43
       -26AB08
        ======
         B0C258
        -BA1285
         ======
          39783A
         -396D53
          ======
            7A8C

base: 16
letters: 0123456789ABCDEF
difficulty: hard