+==============================================================================+
|  DECRYPTION STATION — PUZZLE #13332                                |
+==============================================================================+

  CIPHER TYPE:     WATERSHED
  SECURITY LEVEL:  2/7

  STATUS:          [ACTIVE — AWAITING DECRYPTION]


  MISSION BRIEFING
  ----------------
A 8×8 elevation grid. Compute D8 flow accumulation — drainage area per cell maps to letters.

  INTERCEPTED DATA
  ----------------





> elevation:
  [[35, 37, 38, 70, 86, 27, 84, 47], [48, 39, 32, 32, 86, 77, 70, 71], [70, 19, 24, 85, 84, 73, 16, 23], [15, 28, 13, 42, 77, 71, 13, 66], [41, 32, 84, 16, 14, 15, 53, 76], [64, 43, 20, 50, 60, 19, 69, 43], [75, 26, 28, 86, 60, 24, 62, 65], [11, 10, 67, 28, 21, 29, 40, 72]]



> grid size:
  8



> n chars:
  6



> hint:
  For each cell: find lowest neighbor (8-directional). Water flows that way. Accumulate flow from upstream cells. Sort outlet cells by accumulation -> letters.



> answer format:
  lowercase letters, no spaces or punctuation





  [INTEL] Pool fill: watershed diff 2


  DECRYPTION INPUT
  ----------------


    
    > ENTER PLAINTEXT: 
    > OPERATOR ID (optional): 
    


    [ SUBMIT SOLUTION ]





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