from collections import defaultdict

X = defaultdict(int)

for s in input():
    
    X[s] += 1
    
X = X.values()

n = sum(X)

F = [1, 1, 2, 6, 24, 120, 720, 5040, 40320]

ans = F[n]

for i in X:
    
    ans //= F[i]
    
print(ans - 1)