#include<iostream>
#include<string>
using namespace std;
int main(){
    int len,ans;
    int factorial[9];
    int count[26] = {};
    string S;
    cin >> S;
    len = S.length();
    factorial[0] = 1;
    for(int i=1;i<=len;i++) factorial[i] = i*factorial[i-1];
    for(int i=0;i<len;i++){
        count[(int)S[i] - 65]++;
    }
    ans = factorial[len];
    for(int i=0;i<26;i++) ans /= factorial[count[i]];
    cout << ans-1 << endl;
    return 0;
}