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

public class Main {
    public static void main(String[] args) {

        Scanner scan =new Scanner(System.in);

        int N =scan.nextInt();

        Map<String,Integer> map=new HashMap<>();

      int i=0;


while(i<N){
   map.put(scan.next(),1);

    i=i+1;

}

System.out.println(map.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