import java.util.*;

public class Main {
     public static void main(String... args) {
     	Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        Set<String> items = new HashSet<>();
       for (int i = 0; i < n; i++) {
         items.add(input.next());
       }
       
       System.out.println(items.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