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 (LuaJIT 2.1.0) (judge verdict: Accepted)

local function readas(N)local l=io.read()local r={}for s in l:gmatch"(%a+)"do table.insert(r,s)end return r end
N=io.read"*n"
io.read()
t={}
for i=1,N do
	t[io.read()]=0
end
s=0
for _,_ in pairs(t)do s=s+1 end
print(s)