F627
      +---------
68313 | BA39A29D
       -68313
        =====
        07EB92
       -0098F1
        ======
         FF1C59
        - 5C4D4
         ======
          26776D
         -27FC63
          ======
           2069C

base: 16
letters: 0123456789ABCDEF
difficulty: hard