import math
inputer = input()
north=0
east=0
west=0
south=0


for hogaku in range(len(inputer)):
	if inputer[hogaku]=="N":
		north=north+1
	if inputer[hogaku]=="E":
		east=east+1
	if inputer[hogaku]=="W":
		west=west+1
	if inputer[hogaku]=="S":
		south=south+1

tate = north-south
yoko = east-west
tete_k = int(math.pow(tate,2))
yoko_k = int(math.pow(yoko,2))
kyori =int(tete_k+yoko_k)
print(round(math.sqrt(kyori),5))