import java.io.InputStream;
import java.io.OutputStream;
import java.util.*;
import java.io.PrintWriter;
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

public class Main{
    //WRWWRWRR     wwwrrrrwwwwrrr
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    }
    //	public static void main(String[] args){
//		Scanner scanner = new Scanner(new InputStreamReader(System.in));
//		int n  = Integer.parseInt(scanner.nextLine());
//		String s = scanner.nextLine();
//		LinkedList<Integer> q = new LinkedList<>();
//		for(int i=0;i<n;i++){
//			if(s.charAt(i)=='W'){
//				q.add(i);
//			}
//		}
//		int res = 0;
//		for(int i=n-1;i>=0;i--){
//			if(q.size()==0) break;
//			if(s.charAt(i)=='R'){
//				int v = q.poll();
//				if(v>i) break;
//				res++;
//			}
//		}
//		System.out.println(res);
//
//	}
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} import java.io.InputStream; InputStream java.io import java.io.OutputStream; OutputStream java.io import java.util.*; util.* java import java.io.PrintWriter; PrintWriter java.io import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.io.IOException; IOException java.io import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.InputStream; InputStream java.io import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.StringTokenizer; StringTokenizer java.util import java.io.IOException; IOException java.io import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.InputStream; InputStream java.io public class Main{
    //WRWWRWRR     wwwrrrrwwwwrrr
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    }
    //	public static void main(String[] args){
//		Scanner scanner = new Scanner(new InputStreamReader(System.in));
//		int n  = Integer.parseInt(scanner.nextLine());
//		String s = scanner.nextLine();
//		LinkedList<Integer> q = new LinkedList<>();
//		for(int i=0;i<n;i++){
//			if(s.charAt(i)=='W'){
//				q.add(i);
//			}
//		}
//		int res = 0;
//		for(int i=n-1;i>=0;i--){
//			if(q.size()==0) break;
//			if(s.charAt(i)=='R'){
//				int v = q.poll();
//				if(v>i) break;
//				res++;
//			}
//		}
//		System.out.println(res);
//
//	}
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} Main //WRWWRWRR     wwwrrrrwwwwrrr
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    } solve {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    } int n = in.nextInt(); n in.nextInt() in.nextInt in String[] ss = new String[n]; ss new String[n] n Set<String> res = new HashSet<>(); res new HashSet<>() for(int i=0;i<n;i++){
            res.add(in.next());
        } int i=0; int i=0; i 0 i<n i n i++ i++ i {
            res.add(in.next());
        } {
            res.add(in.next());
        } res.add(in.next()) res.add res in.next() in.next in out.println(res.size()) out.println out res.size() res.size res int testNumber testNumber InputReader in in PrintWriter out out //	public static void main(String[] args){
//		Scanner scanner = new Scanner(new InputStreamReader(System.in));
//		int n  = Integer.parseInt(scanner.nextLine());
//		String s = scanner.nextLine();
//		LinkedList<Integer> q = new LinkedList<>();
//		for(int i=0;i<n;i++){
//			if(s.charAt(i)=='W'){
//				q.add(i);
//			}
//		}
//		int res = 0;
//		for(int i=n-1;i>=0;i--){
//			if(q.size()==0) break;
//			if(s.charAt(i)=='R'){
//				int v = q.poll();
//				if(v>i) break;
//				res++;
//			}
//		}
//		System.out.println(res);
//
//	}
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) Main solver = new Main(); solver new Main() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    } InputReader public BufferedReader reader; reader public StringTokenizer tokenizer; tokenizer public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        } InputReader {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        } reader = new BufferedReader(new InputStreamReader(stream), 32768) reader new BufferedReader(new InputStreamReader(stream), 32768) tokenizer = null tokenizer null InputStream stream stream public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        } next {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        } while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            } tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            } try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                } IOException e {
                    throw new RuntimeException(e);
                } throw new RuntimeException(e); new RuntimeException(e) {
                    tokenizer = new StringTokenizer(reader.readLine());
                } tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public int nextInt() {
            return Integer.parseInt(next());
        } nextInt {
            return Integer.parseInt(next());
        } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public class Main{
    //WRWWRWRR     wwwrrrrwwwwrrr
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    }
    //	public static void main(String[] args){
//		Scanner scanner = new Scanner(new InputStreamReader(System.in));
//		int n  = Integer.parseInt(scanner.nextLine());
//		String s = scanner.nextLine();
//		LinkedList<Integer> q = new LinkedList<>();
//		for(int i=0;i<n;i++){
//			if(s.charAt(i)=='W'){
//				q.add(i);
//			}
//		}
//		int res = 0;
//		for(int i=n-1;i>=0;i--){
//			if(q.size()==0) break;
//			if(s.charAt(i)=='R'){
//				int v = q.poll();
//				if(v>i) break;
//				res++;
//			}
//		}
//		System.out.println(res);
//
//	}
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} public class Main{
    //WRWWRWRR     wwwrrrrwwwwrrr
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    }
    //	public static void main(String[] args){
//		Scanner scanner = new Scanner(new InputStreamReader(System.in));
//		int n  = Integer.parseInt(scanner.nextLine());
//		String s = scanner.nextLine();
//		LinkedList<Integer> q = new LinkedList<>();
//		for(int i=0;i<n;i++){
//			if(s.charAt(i)=='W'){
//				q.add(i);
//			}
//		}
//		int res = 0;
//		for(int i=n-1;i>=0;i--){
//			if(q.size()==0) break;
//			if(s.charAt(i)=='R'){
//				int v = q.poll();
//				if(v>i) break;
//				res++;
//			}
//		}
//		System.out.println(res);
//
//	}
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
} Main
import java.io.InputStream;
import java.io.OutputStream;
import java.util.*;
import java.io.PrintWriter;
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

public class Main{
    //WRWWRWRR     wwwrrrrwwwwrrr
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String[] ss = new String[n];
        Set<String> res = new HashSet<>();
        for(int i=0;i<n;i++){
            res.add(in.next());
        }
        out.println(res.size());

    }
    //	public static void main(String[] args){
//		Scanner scanner = new Scanner(new InputStreamReader(System.in));
//		int n  = Integer.parseInt(scanner.nextLine());
//		String s = scanner.nextLine();
//		LinkedList<Integer> q = new LinkedList<>();
//		for(int i=0;i<n;i++){
//			if(s.charAt(i)=='W'){
//				q.add(i);
//			}
//		}
//		int res = 0;
//		for(int i=n-1;i>=0;i--){
//			if(q.size()==0) break;
//			if(s.charAt(i)=='R'){
//				int v = q.poll();
//				if(v>i) break;
//				res++;
//			}
//		}
//		System.out.println(res);
//
//	}
    public static void main(String[] args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Main solver = new Main();
//        int num = in.nextInt();
//        while(num-->0){
//            solver.solve(1, in, out);
//        }
        solver.solve(1, in, out);
        out.close();
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}