import java.util.*;
import java.util.HashMap;

public class Main{
//public class abc164_c{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		HashMap<String, Integer> hmap = new HashMap<String, Integer>();
		String s = "";

		for(int i=0; i <n; i++){
			s = scan.next();
			if( ! hmap.containsKey(s)){
				hmap.put(s, 1);
			}

		}

		System.out.println(hmap.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