def factorial(n):
    ans = 1
    for i in range(1, n + 1):
        ans *= i
    return ans

def swap(S):
    S = list(S)
    N = len(S)
    d = {}
    set_S = list(set(S))
    for i in range(len(set_S)):
        d[set_S[i]] = S.count(set_S[i])
    ldv = list(d.values())
    ans = factorial(N) - 1
    for j in range(len(ldv)):
        ans = ans // factorial(ldv[j])
    return ans

def main():
    S = input()
    print(swap(S))

if __name__ == '__main__':
    main()