import java.util.Scanner;
import java.util.*;


public class Main {
    
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        Set<String> prize = new HashSet<String>();
        int times = scanner.nextInt();

        for(int i = 0; i < times; i++) {
            String str = scanner.next();
            prize.add(str);
        }

    System.out.println(prize.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