import math
S = raw_input()
now = [0, 0]
for i in range(0, len(S)):
	if S[i] == 'N': now[0] += 1
	elif S[i] == 'E': now[1] += 1
	elif S[i] == 'S': now[0] -= 1
	elif S[i] == 'W': now[1] -= 1
print math.sqrt(now[0]*now[0]+now[1]*now[1])