0083
      +---------
ACEB8 | E186659B
       -E57CF
        =====
         5A025
        -E57CF
         =====
          33579
         -9887A
          =====
          A564CB
         -AEC1A5
          ======
           A01DA

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: D