import java.util.*;
 
class Main {
  
    public static void main(String[] args) {
      
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
       Set<String> set = new HashSet();
      
      for(int i=0;i<N;i++){
        set.add(sc.next());
      }
      System.out.println(set.size());
    }
} import java.util.*; util.* java class Main {
  
    public static void main(String[] args) {
      
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
       Set<String> set = new HashSet();
      
      for(int i=0;i<N;i++){
        set.add(sc.next());
      }
      System.out.println(set.size());
    }
} Main public static void main(String[] args) {
      
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
       Set<String> set = new HashSet();
      
      for(int i=0;i<N;i++){
        set.add(sc.next());
      }
      System.out.println(set.size());
    } main {
      
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
       Set<String> set = new HashSet();
      
      for(int i=0;i<N;i++){
        set.add(sc.next());
      }
      System.out.println(set.size());
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = Integer.parseInt(sc.next()); N Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc Set<String> set = new HashSet(); set new HashSet() for(int i=0;i<N;i++){
        set.add(sc.next());
      } int i=0; int i=0; i 0 i<N i N i++ i++ i {
        set.add(sc.next());
      } {
        set.add(sc.next());
      } set.add(sc.next()) set.add set sc.next() sc.next sc System.out.println(set.size()) System.out.println System.out System System.out set.size() set.size set String[] args args
import java.util.*;
 
class Main {
  
    public static void main(String[] args) {
      
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
       Set<String> set = new HashSet();
      
      for(int i=0;i<N;i++){
        set.add(sc.next());
      }
      System.out.println(set.size());
    }
}