1BDE
      +---------
9EAA0 | 7B376D57
       -9EAA0
        =====
         C40BD
        -8FFCA
         =====
         5B67F5
        -54C5AF
         ======
          1F1AE7
         -1266E2
          ======
           B893D

base: 16
letters: 0123456789ABCDEF
difficulty: hard