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: n = int(input())
  a = [["" for i in range(10)] for j in range(26)]
  dic = [
      "a",
      "b",
      "c",
      "d",
      "e",
      "f",
      "g",
      "h",
      "i",
      "j",
      "k",
      "l",
      "m",
      "n",
      "o",
      "p",
      "q",
      "r",
      "s",
      "t",
      "u",
      "v",
      "w",
      "x",
      "y",
      "z",
  ]
  ans = 0
  for i in range(n):
      b = input()
      p = dic.index(b[0])
      q = len(b)
      if b not in a[p][q]:
          a[p][q] += b
          ans += 1
  print(ans)
  
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"}]