import java.util.*;
import java.math.*;
import java.io.*;

public class Main{
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		HashMap<String, Integer> mp = new HashMap<>();
		String meh = in.nextLine();
		for(int qq=1; qq<=n; qq++){
			String a = in.nextLine();
			mp.put(a, 1);
		}
		System.out.println(mp.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