import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		String num = sc.nextLine();
		int n = Integer.valueOf(num);
		ArrayList<String> s = new ArrayList<String>();
		for(int i=0;i<n;i++) {
			s.add(sc.nextLine());
		}
		Set<String> linkedHashSet = new LinkedHashSet<String>();
	    for (int i = 0; i < s.size(); i++) {
	    	linkedHashSet.add(s.get(i));
	    }
	    System.out.println(linkedHashSet.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