56FF
      +---------
05BC1 | 7BAA796C
       -05BC1
        =====
        E31E69
       -EC5868
        ======
         E91DA6
        -EB421E
         ======
          EF5B3C
         -EB421E
          ======
           42731

base: 16
letters: 0123456789ABCDEF
difficulty: medium