import math
s = list(input())

c1,c2= 0,0

for i in s:
	if i == "N":
		c1 += 1
	elif i == "E":
		c2 += 1
	elif i == "S":
		c1 -= 1
	else:
		c2 -= 1
print(math.sqrt(c1**2 + c2**2))