4562
      +---------
89EA1 | EFDD9805
       -89EA1
        =====
        4F0558
       -423EE2
        ======
         23B6A0
        -21BF32
         ======
          A742F5
         -463767
          ======
           25535

base: 16
letters: 0123456789ABCDEF
difficulty: medium
missing: C