4A32
      +---------
715FC | 15916F3C
       -715FC
        =====
        43995F
       -479D32
        ======
         65E1D3
        -698E43
         ======
          A70EBC
         -A4C9FA
          ======
           A1475

base: 16
letters: 0123456789ABCDEF
difficulty: hard