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

public class Main {
    private static final boolean IS_TAKAHASHI_TURN = true;

    public static void main(String[] args) {
	    // write your code here
        Scanner sc = new Scanner(System.in);
        long giftCount = sc.nextLong();
        Set<String> giftList = new HashSet<>();
        for (int i = 0; i < giftCount; i++) {
            String gift = sc.next();
            giftList.add(gift);
        }
        System.out.println(giftList.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