import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	}
} import java.util.HashSet; HashSet java.util import java.util.Scanner; Scanner java.util import java.util.Set; Set java.util public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	}
} Main public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	} main {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	} Scanner scanner = new Scanner(System.in); scanner new Scanner(System.in) int n = scanner.nextInt(); n scanner.nextInt() scanner.nextInt scanner Set<String> set = new HashSet<String>(); set new HashSet<String>() scanner.nextLine() scanner.nextLine scanner String s; s for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		} int i =0; int i =0; i 0 i<n i n i++ i++ i {
			s = scanner.nextLine();
			set.add(s);
		} {
			s = scanner.nextLine();
			set.add(s);
		} s = scanner.nextLine() s scanner.nextLine() scanner.nextLine scanner set.add(s) set.add set s System.out.println(set.size()) System.out.println System.out System System.out set.size() set.size set String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	}
} public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	}
} Main
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt(); 
		Set<String> set = new HashSet<String>();
		scanner.nextLine();
		String s;
		for(int i =0;i<n;i++) {
			s = scanner.nextLine();
			set.add(s);
		}
	
		System.out.println(set.size());
	}
}