import java.util.*;

public class Main {
    public static void main(final String[] args) {
        final Scanner sc = new Scanner(System.in);
        int N = 0;
        N = sc.nextInt();
        Set<String> tempSet = new HashSet<String>();
        
        for(int i=0;i<N;i++){
            tempSet.add(sc.next());
        }
    System.out.println(tempSet.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