import java.util.HashMap;
import java.util.Scanner;
public class Main
{
    public static void main(String [] args)
    {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt(); HashMap<String, Integer> map = new HashMap<>();
        for (int i = 0; i < n; i++) {
            String s = sc.next();
            map.put(s, map.getOrDefault(s, 0) + 1);
        }
        System.out.println(map.keySet().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