
import java.util.HashMap;
import java.util.HashSet;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        HashSet<String> kind = new HashSet<>();
        int N = in.nextInt();
        in.nextLine();
        for(int i = 1; i <= N; i++){
            kind.add(in.nextLine());
        }
        System.out.print(kind.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