import java.util.*;
class Main
{
    public static void main(String args[])
    {
        Scanner ob=new Scanner(System.in);
        int n =ob.nextInt();
        ob.nextLine();
        HashSet<String> set = new HashSet<>();
        while(n-->0)
        set.add(ob.nextLine());
        System.out.println(set.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