import math
S = raw_input()
x,y = 0,0
for s in S:
	if s == 'N':
		y += 1
	elif s == 'E':
		x += 1
	elif s == 'W':
		x -= 1
	elif s == 'S':
		y -= 1
print math.sqrt((x * x) +(y * y))