#include <iostream>
#include <cstdio>
#include <set>
#include <map>

using namespace std;

int main()
{
	int n;
	while (scanf("%d\n", &n) > 0)
	{
		set<int> masks;
		for (int i = 0; i < n; ++i)
		{
			int a;
			scanf("%d", &a);

			int mask = 0;
			while (a)
			{
				mask |= 1 << (a % 10);
  			a /= 10;
			}

			masks.insert(mask);
		}

		printf("%d\n", masks.size());
		masks.clear();
	}
	
	return 0;
}