????????
      +---------
4D696 | 9A74BB02
       -7A172
        =====
        4C890B
       -0AC53B
        ======
         4C93C0
        -0AC53B
         ======
          463192
         -43ACD1
          ======
          ??????

base: 14
letters: 0123456789ABCD
difficulty: medium