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

        HashSet<String> list = new HashSet<String>(N);

        for(int i = 0; i < N; i++){
            s = scanner.next();
            list.add(s);
        }

        System.out.println(list.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