6128
      +---------
918AC | BD5EA45E
       -0B8E6
        =====
        623734
       -66AB11
        ======
         C46D15
        -C14B82
         ======
          922E2E
         -9CEA28
          ======
           6A085

base: 15
letters: 0123456789ABCDE
difficulty: hard