B620
      +---------
8A734 | A06616D8
       -8A734
        =====
        1C1ED6
       -159896
        ======
         1369ED
        -1CFD1B
         ======
           6A228
          -7B15C
           =====
           19C5C

base: 16
letters: 0123456789ABCDEF
difficulty: medium