import math

class Problem0113:
	def solve(this):
		s = list(input())
		res = {}
		for v in s:
			res[v] = res.get(v, 0) + 1
		
		w = abs(res.get("E", 0) - res.get("W", 0))
		h = abs(res.get("N", 0) - res.get("S", 0))
		print(math.sqrt(w*w + h*h))

if __name__ == "__main__":
	problem = Problem0113()
	problem.solve()