????????
      +---------
38D6A | 44AD32B0
       -7B0C9
        =====
         53372
        -B291D
         =====
         33DB8B
        -3C0A7A
         ======
           8DBD0
          -583DB
           =====
           ?????

base: 14
letters: 0123456789ABCD
difficulty: medium