import java.util.ArrayList;
import java.util.HashSet;
import java.util.Scanner;
class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		ArrayList<String> al = new ArrayList<String>();
		int a = sc.nextInt();
		for(int i = 0; i < a; i++) {
			al.add(sc.next());
		}
		ArrayList<String> al2 = new ArrayList<String>(new HashSet<>(al));
		System.out.println(al2.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