#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    string s;
    cin >> s;
    int f[26] = {};
    rep(i,s.size())f[s[i] - 'A']++;
    int n = s.size();
    int ans = 1;
    srep(i,1,n+1)ans *= i;

    rep(i,26){
        if(f[i] > 1){
            srep(j,1,f[i]+1)ans /= j;
        }
    }

    cout << ans - 1 << endl;
    return 0;
}