import math

s = input()

N, E, W, S = [0, 0, 0, 0]

for c in s:
    if (c == 'N'):
        N += 1
    elif (c == 'E'):
        E += 1
    elif (c == 'W'):
        W -= 1
    else:
        S -= 1

x = E + W
y = N + S

r = math.sqrt(x**2 + y**2)

print(r)