import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        int N = s.nextInt();
        HashSet<String>set = new HashSet<>();

        for (int i = 0; i < N; i++) {
            String str = s.next();
            set.add(str);
        }

        System.out.println(set.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