import java.util.*;
public class Main{


	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);

		long s  =sc.nextLong();
	 HashSet<String> ss = new HashSet<String>();
		while(s-->0) {
			String as = sc.next();
			ss.add(as);
		}
		System.out.println(ss.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