import java.awt.Point;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentSkipListSet;

public class Main {
	public static final int C =  1000000007;
	static final int CY = 1000000000;
	//static boolean MAP[][];
	static int K;
	static int B;
	static int[][] POS;
	static String S;
	static int X[][];
	static int HA[];
	static long DP[];
	static int ST[][];
	static ConcurrentSkipListSet<Integer> TS;
	static ArrayList<Integer> AL;
	public static void main(String[] args) {
		StringBuilder sb = new StringBuilder();
		BufferedInputStream bs = new BufferedInputStream(System.in);
		Scanner sc = new Scanner(bs);

		S = sc.next();
		
	

		long ans = 1;
		
		int[] a = new int[26];
		
		for (int i=0; i < S.length(); i++) {
			char c = S.charAt(i);
			a[c - 'A']++;
		}

		ans = msd(S.length());
		for (int i=0; i< 26; i++) {
			ans /= msd(a[i]);
		}


		System.out.println(ans-1);
	}
	static long msd(int num) {
		long ret = 1;
		
		for (int i=1; i <= num; i++) {
			ret *= i;
		}
		
		return ret;
	}
}