B8A5
      +---------
367BC | 017184A0
       -367BC
        =====
        69F904
       -6A9E8D
        ======
         89B13A
        -8F4ACA
         ======
          E22EF0
         -275C47
          ======
           97BCB

base: 16
letters: 0123456789ABCDEF
difficulty: medium