import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;

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

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