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  1. def gravitation(rows):
  2.    
  3.     def checkMotless(rows):
  4.         #returns needed steps until column becomes motionless
  5.         motless = []
  6.         bedrock = len(rows)-1
  7.         for i in range(len(rows[0])):
  8.             topind = 0
  9.             botind = bedrock
  10.  
  11.             count = 0
  12.  
  13.             topLock = False
  14.             botLock = False
  15.            
  16.             while not (topLock and botLock):
  17.                 if rows[botind][i] == '#':
  18.                     botind = botind - 1
  19.                 if rows[botind][i] == '.':
  20.                     botLock = True
  21.                 if rows[topind][i] == '.':
  22.                     topind = topind + 1
  23.                 if rows[topind][i] == '#':
  24.                     topLock = True
  25.                 if botind == topind:
  26.                     topLock = True
  27.                     botLock = True
  28.            
  29.             print(topind)
  30.             print(botind)
  31.             print("--")
  32.             for k in range(topind+1,botind+1,1):
  33.                 if rows[k][i] == '.':
  34.                     count = count + 1
  35.            
  36.             motless.append(count)
  37.         return motless
  38.            
  39.    
  40.     motless = checkMotless(rows)
  41.  
  42.     print(motless)
  43.    
  44.     ans = []
  45.     mini = min(motless)
  46.    
  47.     for i in range(len(motless)):
  48.         if motless[i]==mini:
  49.             ans.append(i)
  50.            
  51.     return ans
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