import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        HashMap<Character, Integer> counts = new HashMap<>();
        int idx = 0;
        for (char c : sc.next().toCharArray()) {
            counts.put(c, counts.getOrDefault(c, 0) + 1);
            idx++;
        }
        long ans = fact(idx);
        for (int x : counts.values()) {
            ans /= fact(x);
        }
        System.out.println(ans - 1);
    }
    
    static long fact(int x) {
        long ans = 1;
        for (int i = 1; i <= x; i++) {
            ans *= i;
        }
        return ans;
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}