import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.Set;

public class Main {
    public static void main(String... args) throws IOException {
        int n;
        Set<String> s = new HashSet<>();
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        String line;

        line = bf.readLine();

        n = Integer.parseInt(line);

        for (int i = 0; i < n; i++) {
            line = bf.readLine();
            s.add(line);
        }

        System.out.println(s.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