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)

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int, int> pii;

#define pb push_back
#define ff first
#define ss second
#define SIZE 1000001
#define INF int(2e9 + 9)
#define BIG_INF ll(4e18 + 9)
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define _sz(v) int((v).size())
#define sqr(x) (x) * (x)
#define cube(x) (x) * (x) * (x)

//#pragma GCC optimize("Ofast")

ll binpow(ll a, ll b, ll mod = BIG_INF)
{
    ll res = 1;
    while(b)
    {
        if(b & 1)
            res *= a;
        a *= a;
        b >>= 1;
        a %= mod;
        res %= mod;
    }
    res %= mod;
    return res;
}




int T = 1, n, a, b, c, d;
string s;

map<string, bool> used;


void solve()
{
    cin >> n;
    while(n--)
    {
        cin >> s;
        used[s] = 1;
    }

    cout << _sz(used);

}

int main()
{

    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);

//    cin >> T;

    while(T--)
    {
        solve();
    }




    return 0;
}