#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define rrep(i, a, b) for(int i = a; i >= b; i--)
#define fore(i, a) for(auto &i:a)
#define print(x) cout << x << "\n"
#define SORT(a, n) sort(a, a+n);
#define REVERSE(a,n) reverse(a,a+n);
#define VSORT(v) sort(v.begin(), v.end());
#define VREVERSE(v) reverse(v.begin(), v.end());
#define MOD 1000000007
#define yes "YES"
#define no "NO"
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;

int f(int n) {
    int r = 1;
    rep(i, 1, n+1) r*=i;
    return r;
}
int main() {
    fastcin;
    string s;
    cin >> s;
    map<char, int> m;
    rep(i, 0, s.length()) {
        if(m.find(s[i])!=m.end()) {
            m[s[i]]++;
        } else m.insert(make_pair(s[i], 1));
    }
    int ans = f(s.length());
    fore(i, m) {
        ans /= f(i.second);
    }
    print(ans-1);
    return 0;
}