import java.util.HashSet;
import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        String[] arr=new String[n];
        for (int i = 0; i <arr.length ; i++) {
            arr[i]=sc.next();
        }
        HashSet<String> hs = new HashSet<String>();
        for(int i = 0; i < n; i++)
        {
            // add all the elements to the HashSet
            hs.add(arr[i]);
        }
        System.out.println(hs.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