# -*- coding:utf-8 -*-
import math
if __name__ == "__main__":
	s = raw_input()
	x = 0
	y = 0
	for i in s:
		if i == "N":
			y += 1
		if i == "E":
			x += 1
		if i == "W":
			x -= 1
		if i == "S":
			y -= 1
	print math.sqrt(x **2 + y ** 2)