import java.util.*;
import java.util.stream.Collectors;

class Main {
    public static void main(String[] args) throws Exception {
        final Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.nextLine();
        String str;
        Set<String> A = new HashSet<String>();
        for(int i = 0 ; i < N ; i++){
            str = sc.nextLine();
            A.add(str);
        }
        System.out.println(A.size()); 
        sc.close();
    }
}
/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