Problem:
Score : 300 points

Problem 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?

Constraints

1 \leq N \leq 2\times 10^5

S_i consists of lowercase English letters and has a length between 1 and 10 (inclusive).

Input

Input is given from Standard Input in the following format:

N
S_1
:
S_N

Output

Print the number of kinds of items you got.

Sample Input 1

3
apple
orange
apple

Sample Output 1

2

You got two kinds of items: apple and orange.

Sample Input 2

5
grape
grape
grape
grape
grape

Sample Output 2

1

Sample Input 3

4
aaaa
a
aaa
aa

Sample Output 3

4

Solution in Haskell (GHC 8.8.3) (judge verdict: Accepted)

import Control.Monad
import qualified Data.Vector as V
import qualified Data.List as L

check [] _ = []
check (x:xs) vector
    | V.elem x vector = x : check xs (V.cons x vector) 
    | otherwise       = check xs vector

main = do
    n <- readLn
    s <- replicateM n getLine
    print $ length $ V.uniq $ V.fromList $ L.sort s