E433
      +---------
A15DF | 39025CDE
       -A15DF
        =====
         7840C
        -7EF56
         =====
          6285D
         -65B1A
          =====
           DDD9E
          -65B1A
           =====
           E4680

base: 16
letters: 0123456789ABCDEF
difficulty: hard