import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		int n = scan.nextInt();
		String[] mozi = new String[n];
		int count = 0;

		for(int i=0;i<n;i++) {
			mozi[i] = scan.next();
		}

		List<String> listA = new ArrayList<String>(Arrays.asList(mozi));
		List<String> listB = new ArrayList<String>(new HashSet<>(listA));

		for(String s:listB) {
			count++;
		}

		System.out.println(count);
	}

}

/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