#!/usr/bin/env python3
# from typing import *

import sys
import io
import math
import collections
import decimal
import itertools
import bisect
import heapq


def input():
    return sys.stdin.readline()[:-1]


# sys.setrecursionlimit(1000000)

# _INPUT = """XYZYX
# """
# sys.stdin = io.StringIO(_INPUT)

INF = 10**10


def solve(S):
    counter = collections.Counter(list(S))
    N = len(S)
    ans = 1
    for i in range(1, N+1):
        ans *= i
    
    for n in counter.values():
        for i in range(1, n+1):
            ans //= i
    return ans-1


S = input()
print(solve(S))