import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        sc.nextLine();
        String s[]=new String[n];
        for(int i=0;i<n;i++)
        {
            s[i]=sc.nextLine();
        }
        HashSet<String> h=new HashSet<>();
        for(int i=0;i<n;i++)
        {
            if(!h.contains(s[i]))
                h.add(s[i]);
        }
        System.out.println(h.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