import java.util.*;
import java.math.*;
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();
Set<String> s=new HashSet<>();
for(String x:a)
s.add(x);
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