//No.170 スワップ文字列(Easy)


import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No170 {
    
    static final Scanner sc = new Scanner(System.in);
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve() {
        String s = sc.next();
        int n = s.length();
        int[] cnt = new int[26];
        for (int i=0; i<n; i++) {
            cnt[s.charAt(i)-'A']++;
        }
        int[] fact = new int[n+1];
        fact[1] = 1;
        for (int i=2; i<=n; i++) {
            fact[i] = fact[i-1]*i;
        }

        int ans = fact[n];
        for (int i=0; i<26; i++) {
            if (cnt[i] > 1) {
                ans /= fact[cnt[i]];
            }
        }
        out.println(ans-1);
    }

    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        sc.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}
}