import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
	public static void main (String args[]) throws Exception{
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int ans = 0;
		Map<String,String> map = new HashMap<String, String>();
		for(int i = 0;i < n; i++) {
			String  s = scan.next();
			if(map.get(s) == null) {
				ans++;
			}
			map.put(s, "");
		}

		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