AF3E
      +---------
F265F | 58090A9C
       -E6C81
        =====
        ACDCBA
       -ADEE16
        ======
         0C4989
        -03888A
         ======
          B127FC
         -BFF7D8
          ======
           F3584

base: 16
letters: 0123456789ABCDEF
difficulty: hard