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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

function Main(input) {
input.trim();
	tmp = input.split("\n");
tmp.sort(function(a,b){
        if( a < b ) return -1;
        if( a > b ) return 1;
        return 0;
});
	
tmp.shift();

var c =0
var f =""
var n =""
var num =0
var len = tmp.length
for(let i = 1; i <= len ; i++) {
f= tmp[i-1]
n=tmp[i]
if(f!=n){  num++  }

}


 console.log(num)
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));