897
      +--------
E572C | BE133C9
       -9C9AC
        =====
         0734C
        -45E5A
         =====
         E86EC9
        -E8E1EA
         ======
           2689

base: 15
letters: 0123456789ABCDE
difficulty: challenging
hints: 1 << B, E << D
missing: D