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

    return 0;
}