#include <stdio.h>
#include <string.h>
#include <algorithm>

using namespace std;

FILE *f,*s;

int n,i,l,cate;

struct cuvinte 
{ 
	char x[20]; 
};

cuvinte a[36005];

int cmp(cuvinte v1, cuvinte v2)
{ 
	return strcmp(v1.x, v2.x) == -1;
}

int main()
{
	f=fopen("restante.in","r");
	s=fopen("restante.out","w");
	
	fscanf(f,"%d\n",&n);
	
	for(i=1;i<=n;i++)
	{
		fscanf(f,"%s\n",&a[i].x);
		
		l=strlen(a[i].x);
		
		sort(a[i].x,a[i].x+l);
	}	
	
	sort(a+1,a+n+1,cmp);
	
	cate=0;
	for(i=1;i<n;i++)
	{
		if(strcmp(a[i].x, a[i+1].x)!=0)
			cate++;
		
		if(strcmp(a[i].x, a[i-1].x)!=0&&cate>0)	
			cate--;
	}	
	
	fprintf(s,"%d",cate);
	
	fclose(s);
	
	return 0;
}