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

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int N = scanner.nextInt();
        Map<String, Integer> map = new HashMap<>();
        for (int i = 0; i < N; i++) {
            String temp = scanner.next();
            Integer index = map.get(temp);
            map.put(temp, index == null ? 1 : index + 1);
        }

        scanner.close();

        System.out.println(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