p02701 AtCoder Beginner Contest 164 - gacha
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.

Examples

Input

3
apple
orange
apple


Output

2


Input

5
grape
grape
grape
grape
grape


Output

1


Input

4
aaaa
a
aaa
aa


Output

4
```python
N=int(input())
J=[input() for i in range(N)]

print(len(list(set(J))))
```