function getchoice(a, b)
    ret = 1
    for k = 0, b - 1 do
        ret = ret * (a - k)
    end
    for k = 0, b - 1 do
        ret = ret / (b - k)
    end
    return ret
end

s = io.read()
n = string.len(s)
t = {}
for i = 1, n do a = string.sub(s, i, i) if (t[a] == nil) then t[a] = 1 else t[a] = t[a] + 1 end end
c = 1
for k, v in pairs(t) do
    c, n = c * getchoice(n, v), n - v
end
print(c - 1)