#include <bits/stdc++.h>

using namespace std;
ifstream fin("restante.in");
ofstream fout("restante.out");
char a[36002][17];
int cmp(const void *x,const void *y)
{
    return strcmp((char*)x,(char*)y);
}
int cnt=0;

int main()
{
    int n;
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        fin>>a[i];
        int m=strlen(a[i]);
        sort(a[i], a[i]+m);
    }
    qsort(a,n,sizeof(a[0]),cmp);

    for(int i=1;i<=n;)
    {
        int j=i+1;
        while(j<=n and strcmp(a[i],a[j])==0)
            j++;
        if(j-i==1)
        {
            cnt++;
        }
        i=j;
    }
    fout<<cnt;


    return 0;
}