014C
      +---------
C81BB | 7D5085C4
       -C81BB
        =====
        46E735
       -42E099
        ======
         5FA1DC
        -BC0688
         ======
          3ECAB4
         -3241D4
          ======
           B3DAF

base: 16
letters: 0123456789ABCDEF
difficulty: challenging