import java.util.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// くじ引き回数
		int N = sc.nextInt();
        List<String> listA = new ArrayList<String>(N);
		for (int i=0; i<N; i++) {
          listA.add(sc.next());
        }

        List<String> listB = new ArrayList<String>(new HashSet<>(listA));

        //System.out.println("ListA = " + listA);
        //System.out.println("ListB = " + listB);
        System.out.println(listB.size());
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz