import collections

def C(n, r):
    c = 1
    for s in range(n, n - r, -1):
        c *= s
    for b in range(r, 0, -1):
        c //= b
    return c


def solve():
    S = input()
    L = len(S)
    ans = 1
    for n in collections.Counter(S).values():
        ans *= C(L, n)
        L -= n

    print(ans - 1)


def main():
    solve()


if __name__ == '__main__':
    main()