#include <bits/stdc++.h>
#define INIT std::ios::sync_with_stdio(false);std::cin.tie(0);
#define VAR(type, a) type a;std::cin>>a;
// VAR(int, x);
#define OUT(d) std::cout<<(d);
#define SP std::cout<<" ";
#define ENDL std::cout<<"\n";
#define VEC(type, c, n) std::vector<type> c(n);for(auto& i:c)std::cin>>i;
#define MAT(type, c, m, n) std::vector<std::vector<type>> c(m, std::vector<type>(n));for(auto& r:c)for(auto& i:r)std::cin>>i;
#define ALL(a) (a).begin(),(a).end()
#define FOR(i,a,b) for (int i=(a);i<(b);++i)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);--i)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)

using ll = long long;
ll Factrial(ll n){
    if(!n) return 1;
    return n*Factrial(n-1);
}

signed main(){
    INIT;
    VAR(std::string, s);
    std::sort(ALL(s));
    int chara = '\0';
    int cnt = 1;
    int ans = Factrial(s.size());
    REP(i, s.size()){
        if(chara!=s[i]){
            ans /= Factrial(cnt);
            cnt = 1;
        }else{
            ++cnt;
        }
        chara = s[i];
    }
    ans /= Factrial(cnt);
    OUT(ans-1)ENDL;
    return 0;
}