import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N= sc.nextInt();
//		List<String> list = new ArrayList<>();
		String[] list = new String[N];
		Map<String, Integer> map = new TreeMap<String, Integer>();
		for(int i=0; i<N;i++) {
			String s = sc.next();
			if(map.get(s)==null) {
				map.put(s, 1);
			}
		}
		int ans  = map.values().toArray().length;
		
		System.out.println(ans);
	}

}
/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