output_description: Print the number of kinds of items you got.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N
      S_1
      :
      S_N
attempt: import sys
  
  input_methods = ["clipboard", "file", "key"]
  using_method = 0
  input_method = input_methods[using_method]
  
  IN = lambda: map(int, input().split())
  LIN = lambda: list(IN())
  mod = 1000000007
  
  # +++++
  
  
  def main():
      a = int(input())
      # b , c = IN()
      al = [input() for _ in range(a)]
      # s = input()
      n = len(list(set(al)))
      print(n)
  
  
  # +++++
  isTest = False
  
  
  def pa(v):
      if isTest:
          print(v)
  
  
  def input_clipboard():
      import clipboard
  
      input_text = clipboard.get()
      input_l = input_text.splitlines()
      for l in input_l:
          yield l
  
  
  if __name__ == "__main__":
      if sys.platform == "ios":
          if input_method == input_methods[0]:
              ic = input_clipboard()
              input = lambda: ic.__next__()
          elif input_method == input_methods[1]:
              sys.stdin = open("inputFile.txt")
          else:
              pass
          isTest = True
      else:
          pass
          # input = sys.stdin.readline
  
      ret = main()
      if ret is not None:
          print(ret)
  
problem_description: Statement
  
  You drew lottery N times. In the i-th draw, you got an item of the kind
  represented by a string S_i.
  
  How many kinds of items did you get?
samples: [{"input": "3\n    apple\n    orange\n    apple", "output": "2\n    \n\nYou got two kinds of items: `apple` and `orange`.\n\n* * *"}, {"input": "5\n    grape\n    grape\n    grape\n    grape\n    grape", "output": "1\n    \n\n* * *"}, {"input": "4\n    aaaa\n    a\n    aaa\n    aa", "output": "4"}]