#!/c/Python34/python
# coding: utf-8


def main():
    S = input()
    ans = 1
    a = [0] * 26
    for i in range(len(S)):
        ans *= i+1
        a[ord(S[i])-ord('A')] += 1

    for i in range(26):
        for j in range(1, a[i]+1):
            ans /= j

    print(int(ans)-1)

if __name__ == '__main__':
    main()