
import java.util.*;
import static java.util.Map.Entry.comparingByValue;
import static java.util.stream.Collectors.toMap;

public class Main {

    public static void main(String[] args) {

        Scanner Input = new Scanner(System.in);
        int N = Input.nextInt();
        HashMap<String, Integer> HM = new HashMap();

        for (int I = 0; I < N; I++) {
            String S = Input.next();
            if (!HM.containsKey(S)) {
                HM.put(S, 0);
            }
        }
        System.out.println(HM.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