import java.util.Scanner;
import java.util.Arrays;

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();
    }
    Arrays.sort(a);
//    System.out.println(Arrays.toString(a));
    int count = 1;
    for(int j = 1;j < n;j++){
      if(a[j].equals(a[j - 1])){
        count--;
      }
      count++;
    }
    System.out.println(count);
  }
}
/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