def d(n, m)
  r = n
  while (m -= 1) > 0
    r = r * (n -= 1)
  end
  r
end
S = gets.chomp
p S.chars.uniq.inject([S.size, 1]) {|(n, m), c| r = S.count c; [n - r, m * d(n, r) / d(r, r)] }[1] - 1