s=STDIN.gets.chomp
x=0
y=0
s.size.times do |i|
	e=s[i]
	case e
	when "N"
		y+=1
	when "S"
		y-=1
	when "E"
		x+=1
	when "W"
		x-=1
	end
end
puts Math.hypot(x,y)