import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Set<String> set = new HashSet<>();
        int n = Integer.parseInt(br.readLine());
        String[] str = new String[n];
        for(int i=0; i<n; ++i)
            str[i] = br.readLine();
        Arrays.sort(str);
        set.addAll(Arrays.asList(str));
        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