
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {

    /*
     * https://atcoder.jp/contests/abc164/tasks/abc164_c
     */

    public static void main(String[] args) {

        Scanner stdIn = new Scanner(System.in);
        int jogen = Integer.parseInt(stdIn.nextLine());

        Set<String> gacha = new HashSet<>(jogen);
        for (int i = 0; i < jogen; i++) {
            gacha.add(stdIn.nextLine());
        }
        stdIn.close();

        System.out.println(gacha.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