#include <iostream>
#include <string>
using namespace std;
int fac(int n)
{
    if(n <= 1) return 1;
    return n * fac(n-1);
}
int main()
{
    string s;
    int alp['Z'-'A'+1] = {0}, ans;
    cin >> s;
    ans = fac(s.size());
    for(int i = 0; i < (int)s.size(); i++){
        alp[s[i] - 'A'] += 1;
    }
    for(int i = 0; i < 'Z'-'A'+1; i++){
        if(alp[i] > 1) ans /= fac(alp[i]);
    }
    cout << ans - 1 << endl;
    return 0;
}