import java.util.*;
public class Main {
	public static void main(String[] args){
      	
		Scanner sc = new Scanner(System.in);
		int N =sc.nextInt();
			
		Map<String, Integer> map = new HashMap<>();
		for (int i = 0; i < N; i++) {
			String S = sc.next();
			if(!map.containsKey(S)){
				map.put(S, 1);
			}
		}
		System.out.println(map.size());
		
		
      	sc.close();
    }
		
		
}

/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