class Calc0170
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @s = args.shift.first
  end

  def fact(n)
    (1..n).to_a.inject(:*)
  end

  def run
    s = @s.split(//)
    h = s.group_by(&:itself).map { |k, v| v.size }
    fact(s.size) / h.map { |n| fact(n) }.inject(:*) - 1
  end
end

puts Calc0170.new(STDIN.readlines).run if __FILE__ == $0