import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

class Main
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        Map<String,Integer> map = new HashMap<>();
        for(int i=0;i<a;i++)
        {
            map.putIfAbsent(sc.next(),1);

        }
        System.out.print(map.size());


    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz