99F8
      +---------
C7C19 | D4682EFF
       -C7C19
        =====
         3A46E
        -C7C19
         =====
         872BBF
        -8A345F
         ======
          9EFE0F
         -9B4DA8
          ======
           98984

base: 16
letters: 0123456789ABCDEF
difficulty: hard