B855
      +---------
048B3 | 06121D60
       -048B3
        =====
         92E4D
        -3A586
         =====
          D5086
         -74E42
          =====
           72600
          -74E42
           =====
            5062

base: 15
letters: 0123456789ABCDE
difficulty: medium
missing: C