func main()
	var S: []char :: cui@input()
	var x: float
	var y: float
	for i(0, ^S - 1)
		switch(S[i])
		case 'N'
			do y :+ 1.0
		case 'E'
			do x :+ 1.0
		case 'W'
			do x :- 1.0
		case 'S'
			do y :- 1.0
		end switch
	end for
	var ans: float :: lib@sqrt(x ^ 2.0 + y ^ 2.0)
	do cui@print("\{ans}\n")
end func