import java.util.*;

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

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