import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        String[] str = new String[a];
        for(int loop = 0;loop < a;loop++)
        {
            str[loop] = sc.next();
        }
        HashMap<String, Integer> yoloooooooooooooooooooooooooooooooooooo = new HashMap<>();
        for(String s : str){
            yoloooooooooooooooooooooooooooooooooooo.put(s,666666);
        }
        System.out.println(yoloooooooooooooooooooooooooooooooooooo.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