3AC2
      +---------
628BD | C6ED7F30
       -628BD
        =====
         1B6EF
        -98F49
         =====
         35E773
        -3C1927
         ======
          391620
         -3BC43B
          ======
           A066D

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