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 C++ (GCC 9.2.1) (judge verdict: Accepted)

/*
 * Matheus Oliveira
 * 09:04:56 26/04/2020
 * c.cpp
*/

#include <bits/stdc++.h>
using namespace std;

#define EPS
#define INF
#define MAXN 15
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define sc(x) scanf("%d", &x);
#define sc2(x, y) scanf("%d %d", &x, &y);
#define sc3(x, y, z) scanf("%d %d %d", &x, &y, &z);
#define debug(x) printf("%s: %d\n", #x, x);
#define debugarr(x, bg, ed) printf("%s: ", #x); for(int i = bg; i < ed; i++) printf("%d%c", x[i], (i == ed-1) ? '\n' : ' ');

typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;

char inp[MAXN];
set<string> m;

int main() {
	int n;

	scanf("%d", &n);
	getchar();
	
	for(int i = 0; i < n; i++) {
		scanf("%s", inp);
		m.insert( string(inp) );
	}

	printf("%d\n", (int)m.size());
	return 0;
}