#include <cstdio>  
#include <iostream>  
#include <string>  
#include <stack>  
#include <map>  
#include <algorithm>  
using namespace std;  
int main(){  
    int n;  
    string s;  
    int a[45];  
    map<string,int>M;  
    while(~scanf("%d",&n)){  
        cin>>s;  
        for(int i=0;i<s.length();i++)  
            a[i] = s[i]-'A';  
        sort(a,a+s.length());
        for(int i=0;i<s.length();i++)  
            s[i] = a[i]+'A';  
  
        printf("%d\n",M[s]);  
        M[s]++;  
    }  
    return 0;  
}