import math

S = input()

A_x = 0
A_y = 0

for i in S:
    if i == 'N':
        A_y += 1
    elif i == 'E':
        A_x += 1
    elif i == 'S':
        A_y -= 1
    elif i == 'W':
        A_x -= 1

K = math.sqrt(A_x ** 2 + A_y ** 2)

print(K)