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  1.  
  2. def main():
  3. with open("input.txt") as f:
  4. stream = list(f.read())
  6. garbage_stream = []
  7. state = False
  9. for index, char in enumerate(stream):
  10. if char == '>' and isnt_not(index, stream):
  11. state = False
  13. if state == True and char != '!' and isnt_not(index, stream):
  14. garbage_stream.append(char)
  16. if char == '<' and isnt_not(index, stream):
  17. state = True
  19. print(len(garbage_stream))
  22. def isnt_not(index, stream):
  23. '''Check if the previous characters cancel the current character'''
  24. if stream[index - 1] != '!':
  25. return True
  26. else:
  27. i = 0
  28. while stream[(index - 1) - i] == '!':
  29. i += 1
  30. return i % 2 == 0
  33. if __name__ == '__main__':
  34. main()
  35.  
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