# -*- coding: utf-8 -*-
# No.113 宝探し

import math

s = raw_input()

N = s.count('N')
E = s.count('E')
W = s.count('W')
S = s.count('S')

result1 = N ** 2 + E ** 2 + W ** 2 + S ** 2

result = math.sqrt(result1)

print result