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 Lua (Lua 5.3.5) (judge verdict: Accepted)

N=io.read("*n","*l")
ans=1
L={}
for arg in io.read("*a"):gmatch("[^%s]+") do table.insert(L, arg) end

table.sort(L)

for i=1,N-1,1 do if L[i]~=L[i+1] then ans=ans+1 end end

print(ans)