s = input()

x, y, N, E, S, W = 0, 0, 0, 0, 0, 0

for i in range(len(s)):
    if s[i] == "N":
        N += 1
    elif s[i] == "E":
        E += 1
    elif s[i] == "S":
        S -= 1
    elif s[i] == "W":
        W -= 1

x = E + W
y = N + S

print(f'{(x ** 2 + y ** 2) ** 0.5:.5f}')