class Calc0203
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @s = args.map(&:first).join
  end

  def run
    @s.scan(/o+/).map(&:size).max || 0
  end
end

puts Calc0203.new(STDIN.readlines).run if __FILE__ == $0