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)

/* 
 * Author: pawanmsr
 */

#include <bits/stdc++.h>

using namespace std;
typedef long long int ll;

// Macro //
#define X first
#define Y second
#define pii pair<int,int>
#define pll pair<ll,ll>

// Global //

// Functions //

// Main //
int main(int argc, char const *argv[])
{
    // ios_base::sync_with_stdio(false);
    // cin.tie(NULL);
    
    /* code */
    int n;
    set<string> p;
    string s;

    cin >> n;
    for (int i=0; i<n; i++) {
        cin >> s;
        p.insert(s);
    }

    cout << p.size() << endl;

    return 0;
}