#include <stdio.h>
#include <iostream>
#include <stdlib.h>
#include <set>

int main()
{
	int N;
	std::set<int> myset;
	while(scanf("%d",&N) > 0){
	char akt[30];
	int j;	
	for (j = 0; j < N; j++)
	{
		scanf("%s",akt);
	 	int q[10] = {0};
		for (unsigned int i = 0; i < strlen(akt); i++)
		{
	
			if((q[akt[i] - '0'] == 0))
				{
				//printf("%d %d\n",akt[i] - '0',q[akt[i] - '0']);
				q[akt[i] - '0'] = 1;
				}						
		}
			int result = 0;	
		for(int a = 1; a <= 10; a++)
		{
			if(q[a] == 1)
			{
				result += a;
				result *= 10;			
			}
		}
		result /= 10;
		if(result != 0)
{		//printf("%d\n",result);
	myset.insert(result);
		
}
	}
    std::cout << myset.size() <<"\n";
	myset.clear();
}
	return 0;
}