//package atcoder;
 
import java.util.*;
 
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		String A[] = new String[N];
		
		for(int i=0;i<N;i++) {
			A[i] = sc.next();
			//System.out.println(A[i]);
		}
		
		HashMap<String,Integer>map = new HashMap<String,Integer>();
		for(int i=0;i<N;i++) {
			if(map.containsKey(A[i])) {
				map.put(A[i],map.get(A[i])+1);
				//System.out.println(map.get(A[i]));
			}else {
				map.put(A[i],1);
				//System.out.println(map.get(A[i]));
			}
		}
		int ans = 0;
		for(String key : map.keySet()) {
			int temp = map.get(key);
			//System.out.println(temp);
				ans ++;
				//System.out.println(ans);
		}
		System.out.println(ans);
	}
}

/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