class A
  def initialize
    dy = [-1, 0, 0, 1]
    dx = [ 0, 1,-1, 0]

    direct = {'N' => 0, 'E' => 1, 'W' => 2, 'S' => 3}

    s = gets.chomp.split('')

    y = 0
    x = 0

    s.each do |d|
      y += dy[direct[d]]
      x += dx[direct[d]]
    end

    puts Math.sqrt(y**2 + x**2)
  end
end

A.new