inp = input()

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

X = abs(N - S)
Y = abs(E - W)

A = X ** 2 + Y ** 2

import math

B = math.sqrt(A)


result = int(B * 100000) / 100000

print(result)