import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Balloon
{
	public static void main(String[] args)
	{
		// DataInputStream in = new DataInputStream(System.in);
		// BufferedReader in = new BufferedReader(new
		// InputStreamReader(System.in));

		Scanner in = new Scanner(System.in);

		Set<Integer> categories;

		String line = in.nextLine();
		int samples = Integer.parseInt(line);
		categories = new HashSet<>();

		for (int n = 0; n < samples; n++)
		{
			char[] chars = in.nextLine().toCharArray();

			Category cat = new Category();
			for (int m = 0; m < chars.length; m++)
			{
				cat.putNumber(chToInt(chars[m]));
			}

			categories.add(cat.mask);
		}

		System.out.println(categories.size());

		in.close();

		System.exit(0);
	}

	public static int chToInt(char c)
	{
		return ((int) c) - 48;
	}

	static class Category
	{
		public int mask;

		public Category()
		{
			mask = 0;
		}

		public void putNumber(int number)
		{
			mask = mask | (int) Math.pow(2, number - 1);
		}

		public boolean areSame(short another)
		{
			return mask == another;
		}
	}
}