text: #!/usr/bin/env python3
  # coding: utf8
  
  """
  Day 2: Inventory Management System part 1
  https://adventofcode.com/2018/day/2
  """
  
  from collections import Counter
  
  
  def main():
      with open('day02input.txt') as f:
          t2 = 0
          t3 = 0
  
          for line in f:
              counter = Counter(line)
              if 2 in counter.values():
                  t2 += 1
              if 3 in counter.values():
                  t3 += 1
  
          print(t2 * t3)
  
  
  if __name__ == '__main__':
      main()
  