#include <bits/stdc++.h>
using namespace std;

int kai(int n)
{
    if(n == 1) return 1;
    return n * kai(n-1);
}

int main()
{
    string s;
    cin >> s;
    vector<int> cnt(26,0);
    for(int i = 0; i < s.length(); i++) cnt[s[i]-'A']++;

    int a,b,c = 0;
    a = kai(s.length());
    for(int i = 0; i < 26; i++){
        if(cnt[i] <= 1) continue;
        b = kai(cnt[i]);
        if(b > 1) c += b;
    }
    if(!c) c = 1;
     
    cout << a / c - 1 << endl;

    return 0;
}