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

int f(int n) {
    int ret=1;
    for (int i=2;i<=n;i++) ret*=i;
    return ret;
}

int main() {
    string s;
    cin>>s;
    int n=s.size();
    int cnt[256]{};
    for (char c:s) cnt[c]++;
    int ans=f(n);
    for (int i:cnt) ans/=f(i);
    cout<<ans-1<<endl;
    return 0;
}